"Might be fun to play with her a bit more, i'm sure she is having fun as well.", Madison said to herself as she walked over to the case of vials. She pulled a one out, one with two labels: in the first with two separate people and in the second the same two people conjoined.
Madison took off her clothes and then poured some of the contents into Mary's old mouth and drank the rest. Then she turned Mary so that she was horizontal and placed her crotch on her friend's back end. As soon as that was done the bodies joined. Madison groaned once her nerves connected and she could feel Mary, who was not just a human-sized cock, but her human-sized cock now.
Mary throbbed in protest at what her roommate had done, but it only turned Madison on even more, causing precum to drip from her 'mouth'.
Madison felt Mary's breasts which served as her balls too, they were more rigid than normal breasts but at the same time much softer than normal balls. She then caressed her friend, huge drops of precum running down her, and reveled in the alien sensation of having a cock of her own. Soon she felt her orgasm approaching, thinking that was how men felt when they came, but remembering that none had such a big cock or breast-balls she realized that she would be the first to experience such a sensation. She felt the cum rising inside Mary and then she came, the cum hitting the ceiling and making it rain white inside the room.