Now Ty had gotten to experience sex as a boy, both fucking and being fucked, he really wanted to know what it felt like for a girl. Since the boy he'd wished for was bi too, he knew he'd be fine with fucking a girl, and so Ty wished to be a girl.
Twinges of pleasure raced through Ty's body as it started to transform from male to female. His face adjusted, adopting a less firm jawline and forming puffier lips and softer skin, and his hair lengthened partway down his back. His shoulders narrowed and lost some muscle, as did his arms and legs, his hands and feet seeming to slightly shrink too. He felt his hips flare out and his butt enlarge, his skin seeming smooth all over by now. At last he felt the most intensive marks of womanhood emerge- his nipples became larger and puffier, and as he exhaled more and more flesh accumulated around them. He felt his lover gaze on his newly-formed breasts, and felt an odd sense of eagerness. This feeling intensified as his crotch started to change- he saw his penis recede into his body, and his balls were pulled up into him. As they reshaped and became ovaries, something clicked in Ty. She didn't feel like a boy anymore, the idea of being called 'he' felt weird. Seeing the last of her penis readjust into her clitoris and feeling a vaginal opening form at her crotch felt as if her body was correcting the boy he had been into the girl she was. It felt weird, but she figured she'd take this over feeling dysphoric or dysmorphic whenever she wasn't in her old body.
As she looked over at her lover and saw his cock, which had apparently gotten hard from watching Ty turn into a girl, she felt something else that surprised her: her sexuality hadn't changed, she was still bi, but her body's sexual instincts were different. She felt a similar hardening sensation, but realized it was her nipples and clitoris rather than his penis which were becoming erect, and it felt even better. At the same time, a similar moistness to that which he'd felt as a boy from his cock head was building, but now it emerged as her female juices leaking from her slit. Instead of wanting to massage and satisfy the phallus as a boy, she wanted to have her body filled and stimulated as a girl.
She and her lover ended this long moment of aroused haziness by making a move on each other. They kissed, and Ty's lover pushed her to the bed, his hardness rubbing her stomach and giving her unfamiliar butterflies. He could fill her, and stimulate her, and... ohh fuck. He could impregnate her. The possibility felt so enticing to the primal part of her brain.
He shifted down and pushed his cock inside her, making her gasp in surprise and pleasure at how nice this full feeling felt. Again his braced position made him look like an animal in heat, and she realized how much more apt that comparison was since now he could fertilize her.
His hands moved from the bedsheets to Ty's boobs, and she moaned eagerly as his firm fingers grasped her flesh and rubbed and pinched her nipples. When he started thrusting again, his six and a half inches rapidly filling and then retracting from her while his balls slapped her repeatedly, Ty's head swam with pleasure, so glad she'd embraced this female self and the amazing contrast she was now reveling in.
She soon heard her lover grunt as he approached his peak, unable to even speak to warn her of his impending orgasm. Even so, she felt the first pulse and how he lost conscious control of his hips, just to remind her of his masculine instincts. And as his semen pumped inside her, she clung to him with her pussy and her arms and legs, instinctively needing to have him fill her as long as possible. He filled her with so much seed and came so hard both of them took almost minutes to come down from the high.
Once they finally recovered, they looked at each other, smiled and kissed passionately. And Ty wondered what to do next...