The offer

“I don’t think so, are we Ginny?” Hermione asked the redhead.
“I’m certainly not… I think I’m very fertile tonight,” Ginny replied with a grin.
“You’re going to knock at least one of us up tonight Harry Potter,” Luna said with a small laugh, “either that, or you don’t get to have fun at all.”
“Well, Harry? Do you want to let three hot, fertile, single girls down?” Ginny smirked at Harry, as all three took off their bras, revealing their luscious mammaries.
Harry thought things over. He had started dating again Ginny after the fall of Voldemort and found they had a lot in common. He could easily see himself having eventually married her, but they had broken up after a few months as both wanted to focus on their careers, she as a Quidditch prodigy with the Harpies, and he as an Auror. The sex had been great though.

Hermione of course had been his best friend forever, and they had been fucking every night in the tent in what would have been their seventh year after Ron had abandoned them. After the war was over Hermione tried to get back together with Ron, but he had shown no interest in supporting her career choices so she dumped him shortly after. Once they were both single again, Harry and Hermione hooked up, and for a good four months had hardly left the bedroom, until they broke off their relationship so Hermione could go to Australia and collect her parents. Harry had offered to come along, but she wanted to do it on her own. So she left and would be gone for a good year.