I (M 25) have been straight most my life. I have had multiple girlfriends and had enjoyed sex with women.
Recently I got invited to a threesome with a friend(F23) and her boyfriend(M23). It was mostly going to be a cuckolding session. With her boyfriend just watching me rail her.
She started by sucking my cock while her boyfriend just watched. After a while she asked if her boyfriend could join too. She wanted suck both of us together. I was fine with it so I said yes.
She started with our cocks pressed against each other, stroking it together with both her hands while pressing the tip of our cock to her lips. She was fondling my balls while she sucked me. It was kinda over stimulating for me and I was about to cum and she just stopped and my cock was pulsating so hard about to burst. And then her boyfriend got on his knees and finished me in his mouth.
I kinda felt so hot and sexy at that moment. We took a short break, chatted for a bit while she and her boyfriend were just playing with my cock casually stroking it. She sometimes sucked it while we chatted.
I kinda wanted my cock sandwiched between their lips, but I was too awkward to ask her boyfriend to do so.
Later on I just railed her while her boyfriend watches me fuck her.