While reading the forums and watching mmf videos as I think about whether I would want to top or bottom first in that situation. Probably top, as I have always wanted to fuck another guy, preferably while he’s fucking my wife. But then again, I have only ever had my fingers or a dildo in my ass, so the decision is not easy.
Guess it would depend on the situation. I too like dildos in my ass, and have fantasized what a warm cock would feel like.
I'm not doing it right now but around 3:30 this morning, I was awakened by feeling a strong erection; the head of my dick was out of my underwear and lying hotly against my belly and my hand instinctively went to it and started stroking it... hard and fast. My wife is lying next to me, snoring her ass off as I literally pounded my pud but I'm not quite awake. I got out of my underwear so I could spread my legs and feel my balls slapping against my taint - and so I could use my free hand to play with my hole. It maybe took fifteen minutes of vigorous stroking before I felt the pressure suddenly build, my cock grew thicker in my hand; my asshole is clamping down on the finger I had shoved in there and it's a good thing I had pulled my T-shirt up because two big shots of cum flew out of me and landed on my chest and as the rest of it oozed out to cover my hand. It felt so fucking good. I'm more awake now as I reach over to the tray that has wipes in it and clean myself up. I slip back into my underwear, grab my blanket, and rolled over to go back to sleep.