Yes, he does

It looked like, for at least a few second, Ron was having an internally moral quandary about boinking his best friend who had just switched genders somehow. But, as Harry had expected, the teenage hormones won out in the end. He had to pull the car over first, of course. They were at least ten miles out from London, out in the countryside, so Ron was able to land in a nearby field. That done, they both moved into the backseat.

Harry was waiting for him to make the first move, but Ron was just staring at Harry, particularly the barely constrained breasts bulging out of what he hadn't unbuttoned from his shirt. Smirking, he finished the task and completely removed the shirt, but Ron still failed to do anything. Rolling his eyes, Harry muttered, "Do I have to spell it out for him?" before outright telling him, "Ron, I want to have sex with you. Please start touching my breasts."

That finally shocked Ron into action, and sure enough he wasted no time in exploring Harry's soft chest. He touched them, groped them, even started licking the nipples, but by then Harry was more than wet enough, and started taking off his trousers and undergarments. "One second, mate, hold on," Ron said, stumbling over his words as much as he was his own trousers. It was cute for Harry, and any annoyance he may have felt was abated by the clearly hard cock tenting Ron's underwear.

Then those were gone too, and Ron's cock was out in the open air. Harry had seen it more than once in the past, what with them sharing a bedroom at Hogwarts, but it had never looked quite as...delicious, before. Sure, Harry was already wet, but he felt the need to guarantee some more lubrication before they both went to Pound Town. Oh, and the idea of sucking that cock, once it was in Harry's head, refused to leave. So, Harry found himself leaning down, taking Ron's cock, which was surrounded by bright red pubic hair, into his cute feminine mouth and giving Ron a quick but pleasurable blowjob. The feeling was both entirely new to Harry and something that came naturally to him.

Once the cock was covered in Harry's saliva, Harry laid back on the car cushion and used one hand to guide Ron's cock up perfectly with Harry's pussy. Then, Ron finally took the initiative and starting pushing himself in. There was no hymen to block the way, and from the first second Ron was inside of her, Harry knew she was going to love sex as a woman. It started slow, but soon Ron began to pick up speed with his thrusts, and any lingering hesitation that might have existed in Harry's mind fell away. The pleasure completely overwhelmed her, and it wasn't long before both her and Ron had cum. That done, they both did their best to clean up, Ron looking confused and embarrassed, and Harry more confident than ever about his new feminine appearance. Honestly, at that point, he wouldn't have minded if their turned out not to be any way to turn back.