Picking up Pete's package, Dave unwrapped it with excitment, curious to see the gift that he had been given. After struggling with the package for a minute, you open it up to reveal a Bottle of white liquid. "What the heck?" He muttered, looking for a label.
On the bottom, there was a little strip of tape which read "Petes Cum"
After cleaning up the mess, he sat down staring at the bottle of cum. What were he going to do with it? It's not like he can leave it on his desk, that would be weird. An idle thought wandered through his mind, and he brushed his rubber snatch briefly. What if he put it inside of himself? Acting on a whim, he slid down his pants and underwear, revealing his rubber hole. Grabbing the bottle, he held it to himself. It was quite wide, and looked like a mason jar. Would it even fit? Shrugging, he pushed the bottle against him. Immediately, he was hit by a wave of pleasure, causing him to gasp, and arch his back, which in turn pulled his arms up, which can pushed the jar even further. Moaning he sat down, bouncing himself on the slowly disappearing jar. As he bounced the vagina grew more and more, accepting the jar into it and creating an artificial uterus inside him. Eventually, the jar was completely inside the pussy, leaving nothing behind but a notable lump on his stomach. After coming off his sexual high, he leans back and placed a hand on his stomach. The outline of a jar was slightly visible, and he looked a bit odd. Deciding that was enough for now, he reached down to his vagina, and pulled it off, which in turn jerked the bottle inside his newly formed uterus, which cracked and shattered the jar within it. "Shit!" He screamed, scrabbling for the pen he scribbled down that the glass would vanish. Sitting obsurdly still, he slowly reached down and poked his stomach. Nothing but a slight slosh of cum, the jar was gone. Sighing, he relaxed again, enjoying the feeling of cum sloshing inside him. On the inside, the rubber womb grew a pair of ovaries and Fallopian tubes. The ovaries detecting that there hadn't been an ovulation ever, began unloading large quantities of eggs into his cum filled womb, and they attached to his walls, impregnating him with a huge amount of children.
Grabbing his pussy again, he pulled on it and...