Plurality is wild coz it means you can have sucked someone's dick before without having done oral sex with them, because it was technically their dick but the sex was with one of their headmates instead.

Also because sometimes I wanna say "hey your headmate has a GREAT ass" before I remember that it's a communal ass.

Maybe the most comfortable thing to do is decide that the body belonged exclusively to whoever was fronting at the time and that you did not, in fact, suck someone's dick, you just sucked a dick that happened to contain all the same atoms in the same arrangement.