A vial with a plus symbol surrounded by a circle. Madison assumed it meant full body growth, so she downed the entire bottle. She waited for the effects to kick in, a warmth crawling through her body. Moments passed and she began to feel...empty. That's weird, she was fully impailed on the cock, but not she felt like there was nothing in her. She looked down and was mortified, seeing the breasts of Mary slowly start merging with her skin. They forced her thighs and ass to swell even larger as she felt a rumbling in her stomach. She rubbed her belly, uneasy and unsure of what to do, when it suddenly began to shrink. Her breasts started to swell, while her ass doubled in speed. After a few moments, her ass and thighs stopped growing, her breasts slowed, and she felt a strange tingle at her crotch. Moving her breasts out of the way she could see a pink nub forming directly above her clit. She reached a hand down and began to feel it, massaging it while the nub lengthened. A hole formed at its center, the massage turning into full on stroking as Madison was losing herself to pleasure yet again. Her new cock did not stop at any reasonable size, growing stiffly outwards to match the size Mary was. She stroked faster and faster as two testicals started forming. Her balls stretched down to the floor quickly, covering a large area. Nipples began to form on them, just as Mary's did. Madison pumped herself silly, precum oozing as both her hands were occupied. Then she hit it, the verge, the edge, a stimulating emotion shot through her at lightning speed when she came. Her balls churning and spewing their newly crafted load up and over the vial box.
Madison slowly broke out of her sex trance and began to move around the living room, though with much effort. Mary was comepletely gone, minus the new addition to Madison's groin. She decided to...