[M4F] Unexpected Events Lead to Accidental Incest

I'm 31/m, tall (6'6"!!), thin, and fit. Credit where credit is due, I partially (ok, mostly) stole this idea from a prompt I saw from another user. One of my biggest kinks is incest, but my problem with the roleplays is that the characters always have to unrealistically get over the idea of fucking their relative, something that would probably be a much bigger sticking point IRL. The idea for this RP is that we don't know who the other person is until it's too late. Here are a few ideas:

• We attend a party together, but get separated during the night. We both meet people are intend to hook up with them, but we end up in the same dark room. Perhaps one of us got tied to the bed, or we just go at it, without talking. We don't realize who each other is until we've gone too far to turn back.

• Unknowingly we both attend the same swingers party/orgy. The catch is that the party is supposed to be entirely anonymous. We are both wearing masks, and don't know who our partner is until they say something mid-sex that enlightens us both.

• Desperate and horny, I go to a local strip club which sports a glory hole, for those in the know. I know about the glory hole, but little do I know that my sister/cousin/mother/aunt strips at the club and regularly works the other side of the hole...

• We're both attending the same college, and in a closely associated Fraternity/Sorority. As a joke, your sisters and my brothers blindfold us and put us in a room together to see how long it would take to find out that we were set up with our own relative. Unfortunately for their joke, we don't realize until we've gone further than was intended....

As far as the specific relations, we can negotiate. I prefer bro/sis or cousins (basically close to the same age), but am more than willing to play dad/daughter, mom/son, aunt/nephew, uncle/niece, etc.