Once their kiss broke, Liam whispered, "Do you wanna...?"
"Please," Alex agreed, and he carefully took her in his arms and carried her to the bedroom. The contrast between who he'd been and who she'd become felt so dramatic right now, more than it had at any other point since she'd caused the switch.
Liam carefully dropped her down onto the bed, got atop her and kissed her, the two of them starting to make out again. The feeling of Liam's hard cock grinding against her was deeply surreal, but nice, particularly in her aroused state. She slipped her hands under his T-shirt and felt his slightly rough skin, feeling it cutely seem to prick up from her touch. In response, his hands reached carefully to the bare skin between the straps of her sundress, and slid them off her shoulders as she hitched up his shirt.
They reluctantly pulled back to remove their own clothes- Alex slid the sundress off herself, now wearing nothing but panties, and she saw Liam pull off his T-shirt and jeans, a large bulge visible in his underwear.
Alex sat up once she saw it, and reached for it carefully. "I think I wanna..." she mumbled, pulling his underwear off, and once he'd stepped out of it and was stood there naked she carefully took his large penis in her mouth. She felt a little moisture on his head and sucked it, slowly moving forward to take in more of him in.
"Sh-shit," Liam panted appreciatively, and after a few moments he couldn't keep his hips still, holding onto Alex's cheeks as he humped at her mouth. Alex coughed and gagged, and Liam instantly pulled out. "Sorry!" he said anxiously, but Alex's eyes were focused on his thick prick and its shininess caused by her saliva and his juices.
By way of apology, he pushed her carefully back onto the bed and pulled off her panties. For a split second she felt scared, but then he started to lick at her moist folds and engorged clit and a loud moan escaped her mouth. Everything down there was so much more sensitive! As he lapped her juices off her mound and sucked her tiny clit, she felt like she would lose her mind.
After a few seconds, he stopped and she felt a twinge of disappointment- until she felt something else brush along her slit, and looked down to see what Liam was doing. His shaft was positioned just above her mound, his arms were over her and he looked prepped to push inside her as soon as she said it was OK. The sight in front of her felt so surreal and so exciting- she had been a man, now she was a woman and this man, who had been a woman, was about to fuck her.
"You sure this is OK?" Liam checked. Alex nodded, and his penis moved downwards and she felt it push between her moist lips and slowly move further inside her as his hips pushed forward until they were flush with her own. They looked at each other, panting contentedly- Liam unfamiliar with the pleasure from a penis, Alex unfamiliar with the pleasure from a vagina- and slowly he started to move.
His hips moved steadily faster and faster to thrust his cock in and out of her, and he shifted his hands between holding Alex's and reaching down to play with her breasts. When he cupped her boobs and pinched and rubbed at her nipples, Alex felt even more intensity to the sensations- she supposed she must be a 'new self', because she didn't miss how her old body had felt in sex at all. When Liam pounded her, his cock reaching her deepest depths, his balls slapping her body with each thrust, and his warm hands massaged her sensitive chest, her body relished the feelings, loving how different it felt to be female.
Pretty soon, both of them were rapidly approaching their peaks, panting and moaning in unison. Liam's thrusts grew faster and less prolonged, and his balls twitched against Alex's body and his shaft twitched inside her. With a deep groan, he shot several loads inside her and his hands pinched tightly at her nipples.
The sensations from this pushed Alex to her own peak and she came around him, her pussy seeming to suck and clench around him as he filled her body with his seed.
The two of them lay there together for about a minute or so, until Liam finally withdrew and kissed Alex as his cum oozed out of her. They cuddled up together comfortably in a naked, post-coital haze.