I like the idea of Melanie fucking Dan again.

"I guess you're right," I replied to my wife after cumming when she told me she wanted to fuck Dan again. "Part of me certainly does anyway."
"Oh whatever, you know all of you does, not just your dick. I'm going to do it again anyway, regardless though. It felt too good to not do it again."
"Wow, you're so naughty. I always knew you were, but not just how much."
"Well, I might be naughty for fucking him, but you're naughty for fucking Gina too, and kinky for cumming at the thought of me and Dan."
"Okay, you've got me. I guess you're right there too," I replied, pretending to pout.
Melanie looked at me, and a mischievous smile crept across her face. "The only question is, are you as kinky as me?"
"What do you mean?"
"Well, I loved the thought of you having sex with Gina, but even more than that, I got off watching you fucking her. Would you like to watch me fuck Dan, honey?"
"Oh, I'm not sure about that. That might be a little too much."
"Oh come on, you loved watching his big thick dick spreading Gina. Imagine seeing it sliding into me. Imagine watching him cum in me. That'd be even more kinky and erotic than just hearing about it afterwards."
"Oh, shit," I said as I felt my cock rising. It liked the idea even if I wasn't sure I did.
Melanie saw it and smiled, happy with the sight.
"Maybe we'll invite Gina over too, and have a bit of fun with them both tomorrow."
That sounded like a much better idea to me.

"So honey, what do you think?"