"Grow massive tits.". The cock throbbed, Mary trying to talk, ask her friend to help her, but all she could spit out was more precum. Madison poured the contents of the vial into the shaft, setting the empty tube back into the case. As she did, she noticed the vial refill on its own, and she gave it a puzzled look of disbelief. Before she could do anything else, she heard the cock start to spasm, throbbing violently on its own. When she looked she saw the breasts starting to grow out across the couch, starting to sag off of its edge. Madison rubbed her eyes as she watched the nipples leak out onto the floor as they dragged the rest of the breast flesh down. Madison rushed over and started to feel the growing breasts, not believing her eyes. "Oh my, that really is you..", she said, fondling her roomate. Mary was embarassed, yet consumed by lust. She pleaded for release, but could only spit and throb. Precum began to drip down onto Madison's head, pulling her out of her trance. She stood up and bear hugged Mary's shaft, slowly caressing her. Her tempo grew faster as she felt the breasts grow into her legs at the base of the couch. They were huge, but their growth began to slow to a stop around the size of yoga balls.
Mary continued to spit and throb, feeling herself come closer and closer to release. The suspense was killing her, but she loved it. Madison began to lick Mary's head and shaft, sending the pent up girl to exfill her contents. Mary spewed her load into the air, covering the ceiling and surroundings with several gallons of milk infused semen.
Madison stepped back, wiping herself off with her shirt as best she could. While that was fun, she figures that she should help her roomate out, or that she should test more vials while she was unable to resist. She decided to...