The Serum Pt. 05


“Can I ask you a question hun?”

We were laid basking in each other, after the most incredible and intense sexual experience I had ever had in my life. The sheets were still slightly damp with a combination of milk and the jets of cum I had coaxed out of Susan with my tongue, but neither of us cared. I had shrunk back to my normal size but had left my boobs a bit bigger, so they were comfier for Susan to rest her head on.

“Sure,” I replied.

She paused briefly. Clearly this was something that had been on her mind for a while.

“What does it feel like? You know, when you grow?”

That was a really good question.

“So far, I’ve found it depends on the emotion driving it. If it’s anger, like it was with Carl for instance, it feels like a huge burning knot in my chest has burst and is spreading all over my body. But if it’s lust or arousal, it feels like every single nerve ending in my body is being gently shocked with electricity, doubly so on wherever I’m growing.”

“So if I’m playing with your tits whilst they grow, they’re extra sensitive then?”

“Oh yeah, like sensitive enough that it almost feels like I’m cumming.”

“Good to know,” she replied with a sly grin.

I returned the smile. “Anything else you want to know?”

“Well, you’ve only had these abilities for a short time so you may not have yet, but have you done anything beyond just growing taller or makes your boobs or ass grow?”

I had forgotten that I hadn’t already told Susan about exactly what happened in the bathroom that night. I had told her I needed to go in there because I was so turned on by her and then the milk shower I gave her after that must have meant that she thought I had just done that as myself. I was terrified of what her reaction might be. Things were going so amazingly well between us, she was so understanding and considerate and amazingly also seemed turned on my abilities, but was this a step too far, too much of an invasion of privacy when we hadn’t even been together then? No, I had to risk it. I had to tell her. I couldn’t let this hang over my head like a Susan shaped Sword of Damocles.

“I have gone further once yes, but it was a spontaneous reaction rather than a conscious one.”

“Really?” Susan said as looked up at me. She propped herself up a little on my boobs so she could pay full attention. “Go on?”

“Well remember I mentioned about how I’d had to go to the bathroom because you’d turned me on so much?”

“Yes, the night when you passed out turning the bathroom into a milk trough,” she said with a grin. She was enjoying this.

“Well I was trying to calm down and bring myself back to a normal size. As you know it can sometimes be really difficult for me to do that if I’m turned on that much, so I had closed my eyes and tried to focus, but then all I could see in my mind was you and your amazing tits, and I kept thinking about how much I wanted to suck all the milk out of them, and then…”

“And then what?” Susan was visibly excited, I think she might have been getting off on this a little.

“And then when I opened my eyes, I could see you in the mirror.”

“What do you mean you could see me in the mirror? Are you saying that you…”

“Yeah I did. Well I didn’t persay, my body did, but yeah.”

“You turned yourself into me?”

“Please don’t be mad!”

Susan was quiet for a moment. I could see wheels turning behind her eyes. Please tell me this had been the right thing to do!

“Could you do it again?” she finally asked.

“I don’t know to be honest, I haven’t tried it again since then.”

“Try it, for me.”

I nodded and stood. Trying to figure out how it would work, I closed my eyes and focused on Susan and her body. I focused on wanting to be Susan, wanting to please her and answer her request. I felt the electric sensation run through my body as I started to change. Knowing what was happening this time, I observed the feeling of her longer hair falling down my back, my boobs feeling bigger and fuller, my hips widening and my ass plumping up.

I opened my eyes to see Susan still laid on the bed, looking amazed.

“So?” I asked, forgetting it would be Susan’s voice that came out.

Susan looked a little shocked at realising the change extended to her voice too, but she didn’t look disgusted. She didn’t look angry. She didn’t look appalled. If anything she looked like she was checking me out, checking herself out I guess!

“Wow, that’s quite something,” she finally said. “So, was the milk thing before or after this happened?”

“After,” Susan’s voice replied. “When I saw myself in the mirror as you, I just totally lost it. My body reacted to my want to suck milk out of your tits and made me start heavily lactating. I grabbed one of these boobs and started sucking down as much as I could whilst I stared into the mirror and rubbed my pussy. In the end, I drank so much that my belly dragged me to the ground and that’s when I passed out.”

“And this was just as me, you didn’t give me bigger boobs or anything?”

“No, kütahya seks hikayeleri you were already perfect.”

Susan smiled. Could it be possible she was ok with this? I mean it was weird right?

“If that’s how good I actually look, I can’t blame you for reacting the way you did,” she said through a beaming grin.

I beamed back at her, ironically mirroring her expression, and all at once feeling another huge weight off of my shoulders.

“Maybe I could help improve the memory of that night for you?” she purred.

“What do you mean?”

“Well, you were only able to feel what it was like for one boob to be sucked dry, maybe we should do both?”

If I was right about what Susan was suggesting, she wanted me to suck the milk out of one of her (my, this is so confusing!) tits whilst she sucked the milk out of the other. Either this meant she was finally ok with how she looked and was embracing it or she wanted me to feel better about the situation, but what was 100% clear was that she was ok with what I had done! Not only that, she was eager to taste and fill herself up, and I couldn’t have made myself say no even if I had wanted to.

She sat herself on the edge of the bed, ready and eager to get started.

My body made my boobs start lactating as I walked towards her until she was eye level with a vision of her own, milky tits. “You first hun,” she said looking up at her own face staring back at her but seeing only me.

I raised a single, heavy breast to my mouth and began to drink. She latched on to the other breast and began to suck and pull, getting every last drop.

“I taste so good Sian,” she moaned between sucks.

* * * * *

I never thought I would be living a life where all my dreams would come true in such quick succession. Susan was mine, and I was hers, completely and inescapably. I had never felt love so dearly, so strongly, so intensely before, and every day felt like I was walking on air. Susan would keep the house for me while I worked, completing all the tasks that would have traditionally been done by a wife I suppose, but I hated to think her as some sort of patriarchally conforming good little housewife so we never described it as such. She was free to do whatever she wanted, there was no expectation that she do anything at all, I would have quite happily left to her to lounge around all day relaxing, but she made herself busy and it made her happy, so I wasn’t about to judge.

I was pulled away from my daydreaming by an approaching lab assistant. Her name was Ellen, she was a young girl, a little pudgy with a pretty face and large glasses, like an alternate universe version of myself before the incident.

“Here’s the latest results on the Serum resynthesis Dr. Boley, it looks like we’re almost there.”

“Thank you, Ellen. Did Dan not want to bring me these? He’s usually the person who reports back to me?”

“Oh, I think he said something about needing to use the bathroom and asked me to do it instead.”

The poor guy clearly hadn’t recovered from my testing yet, which was all the more impressive given it was over a month ago!

“Ok, thanks again Ellen, you leave this with me.”

Ellen politely nodded and smiled before heading back to the lab’s work area.

I checked over the results. Judging by what I was seeing, we had less than a day left before the Serum would be ready again. My thoughts went back to Susan. I had a proposal for her tonight that I hoped would take our relationship even further.

* * * * *

We were laid in bed later that evening. Susan was casually fondling my tits as I laid back and tried to work out how to broach the subject I wanted to talk to her about.

“Susan, hun, could you stop that for a second?”

“But I want my bedtime milk,” she whined, dropping her lip like a petulant child, but with a look of impish mischief in her eyes.

“You can have all you can drink and more later hun, I promise.”

She turned her sulk into a smile.

“I have a question for you Susan.”

“For me?”

“Yes, but it’s quite a serious one so do bear with me.”

“Ok, you have my full attention. Ask away.”

I adjusted my position so I was sat up and could look her directly in the eye.

“This morning you asked me what all of this felt like, when I grow and such. Was it just curiosity?”

“I suppose so yeah, I mean it’s something so outside of any experience I could probably relate it to, I felt like I had to ask.”

“Ok.” I pondered for a moment. “But what if you didn’t have to ask?”

She looked puzzled. “What do you mean?”

“What if you could feel it too?”

I could see she was starting to put the pieces together. “Sian, are you saying that…”

“Yeah I am. Tomorrow we will have successfully resynthesised the original Serum that gave me my abilities. I’ve thought about this for most of the day Susan. What I want to know is, do you want to be like me, to be able to do what I can do?”

Susan was silent for a moment. She was clearly struggling to come up with an answer.

“Please let me just say first,” I continued, “that this in no way means I definitely want you to take it. I wasn’t given the choice, and to be honest I’m not sure it’s a choice I would have made if I was still the woman I was back then. The woman I am now would jump at the chance, but that is just with the benefit of hindsight. If it is what you want, then I will make sure it happens. If it isn’t, then we continue on as we are, happy and content.”

“It’s a lot to consider Sian, like it’s a life altering change to make, literally!”

“I know it is hun, I know. But I wanted you to know that if you want to feel like I feel, and do what I do, you can have it.” We paused again. “Take some time to think about it, it won’t be ready until after tomorrow anyway.”

“Won’t you get in trouble for taking it away?”

“I have thought of that. I have had my team working on a creating twice the amount as last time to ‘send a sample to the higher ups’. There will be enough to continue our research and to do this, if that is what you want to do?”

Susan paused again. “I’ll think about it,” she finally declared.

“Ok hun,” I said with a smile.

“Do you know what helps me think though Sian?” she said with a wicked grin.

“I can guess,” I laughed, as I started to grow my boobs and fill them up, ready for her to tuck in.

* * * * *

It was the following morning and I was getting ready to leave. I had woken quite early, my suggestion to Susan firing through all of my synapses at once. I thought about the all the possibilities available to us if she went through with it, all of the sensations we could feel together, all the passion and emotion that would erupt from us. But then I had to calm myself. Susan had the right to choose for herself, and I had to respect that decision no matter what. Susan was sat on the sofa, finishing her morning cup of coffee.

“I’ll see you later hun!” I called making my way towards the door.


“Yes hun?” I said stopping in my tracks.

“I want to feel like you feel and do what you do.”

I walked back over to her, a huge smile on my face, and kissed her.

“Whatever you want hun.”

* * * * *

I was ecstatic. Knowing how intensely I felt the pleasure of our every interaction thanks to my abilities, I couldn’t wait for Susan to be able to experience it too. I had made sure she knew I would respect her decision, but I could not deny that I heavily favoured the answer she gave me. I don’t think I was even that concerned with whether she got bigger or not, it was the pleasure, the orgasmic feeling that came with it that I wanted her to experience.

I was returning home with the samples of the Serum in a sealed lock box. I had been working on a way to make the inhalation of the fumes as easy as possible and had settled on a single use inhaler that I had 3D printed in the lab. Susan would take a single puff from the inhaler, and that should be all that was needed.

I walked through the front door to the aroma of a freshly cooked meal. I could see a bottle of champagne resting next to two glasses, with plates and cutlery laid out on the table, and a candle finishing the look off.

“Hey hun!” said Susan walking through from the kitchen. She was wearing a tight, button up shirt that accentuated her ample boobs wonderfully and a pair of tight skinny jeans that did the same for her bottom half.

“This looks amazing hun!” I said as we embraced and kissed.

“I figured tonight was a big night and I wanted to do something special to mark it.”

She really was a complete diamond, outshining any and all others.

We sat and enjoyed the meal Susan had prepared for us and topped it off with the bottle of champagne. We talked and laughed as usual but made little reference to what exactly was going to happen. I could tell Susan was nervous. Once we had finished, we sat on the sofa and I turned talk towards The Serum.

“So, I’ve got everything in here,” I said raising the lockbox. “When I took this by accident, it was breathed in, so I’ve created a kind of single use inhaler for you to use. It should be safer and more efficient.”

Susan sat in silence but with a smile.

“Just so you know Susan, you can still back out of this. I know you said you wanted to do it this morning, but the fact is this is still an unproven formula. It worked on me but it could have just been a fluke. I haven’t tested this on anyone else yet so I don’t know if we even should to be honest…”

Susan placed a hand on my knee and hushed me.

“It’s ok Sian, I appreciate what you are saying, but I also trust you have done everything you possibly can to make sure that this is as safe as possible. I understand there are risks, but I am willing to try this. It’s just it is still a big decision and a big change, so I’m still sort of processing it, ok?”

“Ok,” I said, trying to hide my nerves.

I was sure this would work, certain even. And I wanted Susan to be able to feel what I felt. It was time.

“So, shall we do this?”

“Let’s go,” she replied.

I passed her the inhaler and watched nervously as she checked it over. She put the dispenser hole in her mouth and pressed down the release. I heard the pressure from the inhaler releasing as she breathed The Serum in. She removed the inhaler from her mouth and took a small cough.

“Are you ok?” I frantically asked. “I’m so sorry, I should have used a less forceful cannister…”

“It’s ok,” she said, her breath almost caught, “it was just a little shock you know?”

She passed me back the empty inhaler which I placed back into the lockbox.

“So what happens now?” she asked.

“Well it took nearly a week before I noticed I could make any changes, but that was by accident and I’d been in isolation. Because you’re aware of it I’m pretty sure that it will take less time but I can’t be sure. Susan? Susan!!”

Whilst I had been talking she had grown groggier and groggier and had now collapsed on the sofa.

“Oh my god Susan, what have I done!”

I darted towards her in sheer panic. My immediate thought was that I had just killed the love of my life. I had convinced her to take an experimental and unproven drug that had killed every other being it had come into contact with other than me. How could I have been so stupid! Tears streaming down my face at what I had done, I checked for her pulse and heartbeat. Her pulse was there, she was alive! She was still breathing but it was slow and drawn out, like she was in an incredibly deep sleep.

This revelation abated my panic somewhat, but we weren’t out of the woods yet, not at all. There was every chance she could be in some sort of a coma, or brain dead. I wasn’t going to let myself off the hook so easily. Doing the only thing I could think to do, I moved her from the sofa to our bed and laid her down so she was resting flat on her back with her head against her pillow.

She looked peaceful and beautiful as usual, but I couldn’t get the idea out of my head that something had gone horribly wrong. I should have been anticipated that at the very least she might lose consciousness, it was exactly what had happened to me, I should have picked up on that! I should have waited until we could test it further instead of giving into my desire! I should have ran more tests on myself to understand what was happening! I should have…


She was awake! More importantly she was alive! Relief, fear, panic, concern, all were colliding in my brain.

“Susan! Are you ok? How do you feel?”

“I feel alright, just a bit groggy. Did I pass out?”

“Yes you did, I’m so sorry, I should have prepared you for that, I completely forgot…”

“It’s ok hun, calm down. I’m still here, I’m still with you.”

She propped herself up on the bed, still in the clothes she had been wearing whilst we had dinner. I sat down next to her, feeling better for being in closer proximity to her.

“Do we know if it’s worked?” came her bleary response.

“Well I didn’t notice for at least a week, but I was in isolation and had no idea what I was looking for anyway,” I said, continuing what I had been speaking about before Susan collapsed. “Potentially, it could already be possible for you to change something. When I started out I began by saying what I wanted out loud so I could visualise it in my mind and then my body just kind of did it’s own thing.”

“Ok, let’s try that then.”

“Close your eyes, think about what you want, visualise it, and keep it in your mind as you say it out loud.”

Susan closed her eyes and took a deep breath.

“I want bigger boobs,” she said out loud. It was a classic choice but maybe not what I would have expected given how perfect hers already were. Maybe she was just following my lead.

It took a moment, but suddenly I started to hear the familiar sound of flesh swelling up and the creak of the blouse Susan was wearing as it tried to hold her in.

“Oh god Sian, this is amazing!” she moaned, living every moment I did the first time I grew on purpose.

Her tits were looking heavier and fuller than they had ever done before, and I could see her blouse was fighting against them. It wouldn’t be long until…

“Susan, hun, you might want to undo your blouse.”

Either she couldn’t hear me or she didn’t care. One by one the buttons popped off of her blouse, eliciting an ‘ooh’ from Susan with each pop until finally the blouse lost the battle, and Susan’s now humongous tits hung triumphantly in front of her. Luckily, she hadn’t been wearing a bra, or doubtless that would have also been ruined.

Her growth had finally come to a stop.

“Wow,” she said, panting slightly.

“Wow indeed,” I replied.

Watching Susan grow like that had almost been more than I could handle. I was holding myself together, not wanting to take away from Susan’s moment, but the instinct to match her boob size and then maybe even exceed it was incredibly hard to overcome.

She looked down at the snowy mountains that had just sprouted from her, and gave them a wiggle side to side, making her giggle and resulting in a very pleasing sway and wobble.

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