[M4A] Heteroflexible Roommates

I've recently been getting off to scenes with some bisexual leaning content in it. I don't think I could ever be with a man alone but in the heat of the moment of a three-way or group sex I can absolutely see myself gripping another man's cock and stroking it or feeling another man's hand push my cock inside a woman's pussy. Maybe a girl uses another man's cum as lube while stroking me off or a guy licks my shaft while Im thrusting in and out of a tight pussy. Whatever the context, the idea of Heteroflexiblility turns me on and I'd love to play a scene with someone of any gender involving it. One idea I had:

Me and my college roommate have become more and more comfortable around each other over the years, seeing each other naked, walking in on each other masturbating or having sex, hearing stories of the others escapades. It's become less common to shut the door when masturbating and less of a concern to be fully clothed at all times. Maybe we've even started watching porn together or masturbating in the same room but we've never touched each other in a sexual way.

One day I go out to the bars and come home with a gorgeous girl we both have class with. When I come back my roommate is masturbating and the girl sees it as do I. My roommate wants to finish and I want to fuck this girl so we have the idea to do it together. What comes next is a very heteroflexible threesome.

I'm open to anything else as well if you have any other ideas you want to play out.

Kinks I'd love to work into the scene: heteroflexiblility, handjobs, rimjobs, prostate play, feet, anal, double penetration, double barrel handjobs and blowjobs, watersports, cum play, exhibitionism

I have no limits of any kind so feel free to suggest anything at all.