Test 2: Playing With Her Tits

Rebecca had opened up the opportunity for me. I knew that we were still on shaky ground from yesterday, but I couldn't quite help myself. I'm a man and I liked boobs, especially bigger ones. And what better way to test this God-like power than by indulging my fantasies a little bit?

I smirked in anticipation as I navigated to the Breasts menu and opened it up. There were several options like Nipples, Perkiness, and Lactation, but the only option that I was interested in at that moment was Size. I clicked it open and a slider appeared with a check box underneath it I could check off to "Toggle Uneven". At the moment, the slider was about 25% of the way across. I placed my finger on the slider and moved it from 25% to about 60% across. As I hovered over the Apply button, I took one last moment to look at her small perky B-cup breasts before I applied the change.

"Oh! You picked somethi-" Rebecca said before noticing the clear points on her shirt where her nipples stood at full attention. "What the fuck..." With an audible gasp, Rebecca watched in astonishment as her left breast surged forward. It grew out fast, only taking about 3 seconds before completing its growth. There was a half second's breath where her chest was unevenly matched before her other breast grew out as well, stopping when it reached the same size as it's neighbor. Before the change, Rebecca had small mounds on her chest, but she was now actively palming tits that had to be about 2 cups larger.

"Holy shit," I murmured under my breath. Part of me thought nothing noticeable would even happen, but clearly I was wrong.

"Jesus, dude, what's with you and my boobs?" Rebecca asked incredulously as she hefted her new-found weight on her chest. I was a little ashamed at first, but her astonishment and confusion broke into a large grin. She liked the change too, maybe? "Wow, these have to be close to D-cups at this point! This app might actually put plastic surgeons out of business!"

I laughed at the incredulity and silliness of the situation, but she wasn't wrong. This could change... well, everything! "Do they feel, uhhh, normal?" I asked tentatively.

"Yeah, I suppose. They feel like my boobs just.. you know, bigger." Without warning, Rebecca started to take of her tight shirt that was now showing her midriff after her most recent growth. I blushed, not really knowing what to do, but she was too absorbed in her tits to care about my awkwardness. She had on a white lacy bra that was trying its hardest to contain the newly-grown boobs, but the new flesh was peaking out of both the top and bottom of the bra.

"Fuck, this is incredible..." Rebecca was now straight-up fondling her new breasts in amazement. "They're more sensitive too. Oh my god, I can't believe how good these feel." Rebecca paused, looking up from her personal groping to finally acknowledge me. "Was it a slider thing?"

I was still zoned into her tits and had to shake my head back to consciousness. "Oh, uhh, yep. Moved it to about 60 percent or so for... those..."

She smiled mischievously. "Do it again. 100 percent!" Rebecca accented this last bit by grabbing both boobs and lifting them in display. "I want to see how big these girls can get!"

I didn't need a second request for that. I fumbled for my phone, reopened the Breasts menu, and moved the slider for Size to 100% before clicking Apply. Immediately, both breasts surged forth in Rebecca's hands, pushing the lace bra to its extremes. Rebecca's face flushed as she moaned her pleasure watching her boobs grow out even further. They quickly reached the size of cantaloupes before a loud SNAP reverberated in the room and her bra finally gave up the fight. The F-cup sized tits looked huge on Rebecca's small frame as she held her broken bra in place over them in a last act to preserve her modesty.

"Umm, Brett, could you possibly... turn around for a sec?" Rebecca asked sheepishly. I didn't respond right away... if this was a cartoon of some sort I'm sure my eyes would've been bugging out my head and my jaw would've been on the floor. Rebecca coughed in annoyance, finally grabbing my attention from her beautiful new rack.

"Right, right, sorry." I apologized absently as I turned around to face the wall. Rebecca briskly stood up, walked out of the Research Room, and returned wearing a tight fitting sweater. Both of our faces were flush with excitement, not just from the bigger tits either. The endless amount of uses I could see for this program in the medical field was incredible and life-changing. Furthermore, I'd just lived a fetish of mine in real life and was trying hard to keep my dick under control.

We both returned to the tables and compared the changes in sensitivity, weight, and bounciness to Rebecca's chest. There didn't seem to be any side effects to the recent growth and, despite their increased size, her breasts retained the natural perkiness they'd had before with no signs of sagging. Rebecca let me feel the weight myself, for scientific purposes of course, before we restored her chest to its normal B-cup size. We'd found out over several attempts that the Revert button worked like an Undo option, but it could only do one change back at a time. So, after 2 pushes of the Revert button, the slider had returned to the 25% placement it had had at the beginning of the day.

The rest of the tests were fairly uneventful after that. We took a short lunch break then returned to the research room feeling invigorated and ready to go. I tried the height slider and was sad to find that, when maxed or min'd out, Rebecca only changed by 5 inches or so. We played with her hands, experimenting with making her fingers as thick as mine and then thinning them out almost to the size of pencils. We were shocked to find that we could even make the beginnings of webbing appear between her fingers!

After several hours of making and reverting small changes to Rebecca, we decided to call it a night and go over our notes for tomorrow. Rebecca stood up and reached for the patch on the back of her neck, but froze, a look of confusion on her face. Her other hand reached up for her neck as well and she started to breathe heavier in the beginning stages of panic. "Uh, Brett?"

I turned around to see her early panic signs and grew concerned. "What's up? Something wrong with the patch?"

"I-I-I can't feel it. I can't feel the patch, it's not there anymore!" Rebecca was really panicking now. "Please tell me you can see the patch on my neck." She turned around and flipped her braided red hair over the other shoulder so I could clearly see her neck. There was an obvious purple area that was the same size and shape of the patch, but, to my surprise, it was buried under a thin layer of her own skin!

"What the fuck..."