A noise got Katie's attention. When she opened her eyes, looking down her body, she saw a stream of cum fly from her two pussies, striking Tiff right in the chest. Tiff backed away from Katie, pulling off her shirt, which was already soaking through. Katie blushed, "Oh god, Tiff! I'm so sorry, I didn't think.."
Katie's apology cut short once Tiff was finally able to get off her shirt. It had soaked all the way through the shirt, even her bra was wet, but that's not what stopped Katie from speaking. Tiff's breasts were shrinking right before her eyes. Tiff panicked pulling off her bra, she cupped her breasts as they faded away, her nipples shrinking to the size of pennies. A tingling in her panties caused tiff to reach a hand down her skirt. Feeling something she doesn't expect, she pulls off her skirt and panties. She sits and spreads her legs, feeling in a blind panic, her vagina is gone, completely sealed except for her clit, which was swollen.
Tiff's clit continued to swell, pushing further up her body until it was on the front of her pubic area. The slit mushroomed, suddenly pushing outward from her body, a hard shaft forming under what now looked like the head of a penis. The shaft continued to grow until it reached almost eight inches in length. The skin beneath began to loosen, swelling out to form a large sac, which, with a tugging pain filled with two large testicles.
Tiff's body began to change more, her hips shrinking as her shoulders broadened, more muscle definition appearing on her body chest pushing out again, but this time as pecs, as her arms and legs thickened. She gained a few more inches in height, her body now unmistakably male. As the hair on her, now his head pulled in, becoming short, hair every where else on his body began to grow. His legs and arms both developed a layer of dark hairs, his pubes becoming denser. Finally a thin treasure trail grew up to his navel as a few fine hairs grew across his chest. Tiff now looked like what could easily pass as her twin brother.
Tiff felt another sharp pain in his crotch, his penis began to thicken, until the head split. The split continued down the shaft until there were two identical eight inch hard shafts protruding from his body. His sac swelled even more as two more testicles dropped, the sac now containing four egg sized balls.
Tiff looked at Katie, "What did you do to me?"
Katie shook her head, "I.. I don't know! It wasn't me!"