Once she had recovered, Rebecca pulled herself off Ty and withdrew from his pussy. The boy blushed at the weird sensation of her cum leaking out of him. As he wished, Rebecca's eyes were drawn from her new cock by his groaning, and she saw his labia seal up into a scrotum, balls move inside it, and his clit swell again into a penis. "Shy, huh?" she teased. "I thought a pussy really suited you!"
"Thanks," Ty giggled. "I just changed it back because I don't really fancy getting pregnant."
"Oh, good point," laughed Rebecca. Her eyes were wandering again, and she spotted his tight asshole between his still-spread legs. Her mind quickly filled with horny thoughts once more, and she felt herself getting hard again.
She instinctively rubbed against his hole, and Ty yelped a little in surprise. "Whoa, wait!" he protested. "I, uh..." As Rebecca moved away, he saw her 7 impressive inches, and was surprised to feel his own cock tingle. Ty was about to say he 'wasn't gay' or something like that, but realizing that kinda didn't work considering Rebecca was obviously still a girl, he instead went with the more accurate, "I've never had anything in my ass before."
"There's a first time for everything," Rebecca answered smoothly. When her shaft rubbed his own, he felt a twinge of arousal race through him. "Please? I really wanna use this thing again." Ty was still not sure he wanted to go through with it, but her next offer convinced him. "If you let me cum in your ass," she purred, you can cum in my pussy when we've both recovered."
Smirking, Ty replied, "Deal," and wished for his ass to be lubed up so she could fuck him painlessly, just to save them both some time. She shoved her cock into his warm hole, and the two of them grunted eagerly. Ty's ass felt so much tighter than his pussy, and the feeling of his hard cock rubbing her stomach was weird but pleasant to Rebecca. It was even better for Ty, whose shaft was just under her impressive tits.
Rebecca soon started thrusting, and the two kissed messily, moaning whenever their lips parted. She loved the feeling of her thick rod pounding his constricting hole, sometimes even slapping her balls against his butt or holding his shaking hands tightly, her fucking him giving the illusion of greater strength even though the two were about even. That illusion was further helped when her cock found Ty's prostate and made the boy moan with pleasure as she fucked it repeatedly.
Ty, on the other hand, was quickly growing to love the growing masculinity and femininity of Rebecca's body. Her intense pounding and mating presses were counterbalanced by the contact of her soft, dark skin and his penis touching her warm, full, slightly bouncing breasts.
He heard her moan, and felt her cock pulse and her hips stiffen and twitch as she filled him with her cum for the second time that day. This time, of course, he could retaliate, and he groaned excitedly as he shifted himself so his cock was right against her boobs. He hit his mark as best as he could, streaks of cum shooting across her stomach and the bottom of her tits, and the two kissed sloppily again, both feeling the high of cumming with a penis and loving it.