Offer to pay him back

"No reason for you to go away unsatisfied," I said. "I mean...you did give me the best birthday present I've gotten this year."

"Oh...maybe someone is gay," David said with a smile. "I've been fantasizing about getting you alone for years. If I had known you would be so open to the idea I'd have made a move sooner."

I still didn't think of myself as either gay or bisexual, but I had just cum in another guy's ass and I was about to...what was I about to do?

"So what do you have in mind, birthday boy?"

David put his hands on his hips and smiled at me. His hard cock pointed straight at me.