There was a scene I've been able to play out a few times.
One time I particularly remember was when I was younger (and I suppose considered hotter, 20s, 5-10, about 130 lbs. of skinny boy) in the basement area of the hotel of a gay resort in Saugatuck, Mich., they rent rooms just like the hotel, but they were really cheap, like $25 or $30 a night and all you got was less than what was a room in a bath house (barely enough room to fit the twin-size mattress in, there was just enough room to swing the door open and miss the mattress) and the hallway would be one of the cruisy areas after the bar in the resort let out at 2 a.m.
I had a room in that cheap area, it was all I could afford, and had maybe one or two drinks at the bar, just enough to loosen me up (inhibition-wise, that is). A public area in the hallway of the basement rooms near the gang showers had a place to sit and was well-lit, and I met a guy while cruising the hallway who I thought was hot, had muscles, cute, oozed sex, etc., and we end up both naked making out, I'm on top of him sucking his dick then backing my ass onto his cock and fucking myself -- bareback of course.
Guys I'd consider "trolls", part of the group I'm more or less in now, maybe quite a bit older, heavier, just not very good looking or whatever -- are watching, all clothed, some just staring, some rubbing themselves, some openly stroking their cocks.
The guy I'm with is watching me watch them, and I suppose I had a hungry look even though the guy is fucking me, or I'm fucking myself, on his pretty decent cock. He half-asks, half-says, "You need more cock"; I don't object, in case that made any difference; and he picks out the heaviest guy, cuz I remember I can't actually see his dick under his big belly, and motions him over. Big Boy is stroking for about 5 seconds and my fucker turns my face toward him and says "Suck."
With some work getting under his belly while Big Boy's standing up, I suck him, and the crowd slowly (or not so slowly?) moves closer. I don't know for sure if Big Boy came in my mouth, but I know I took at least 2 or 3 loads that way, plus my fucker shot up my ass during all this.
I know my fucker liked turning me out to the masses, cuz I remember at one point this wrinkled up guy stepped up for his turn in my mouth and I recoiled a bit. My fucker basically said if I wanted to keep taking his dick and getting his load I'd better not refuse anybody, so I didn't. And once I got started on Mr. Octogenarian (not really a stretch on the name?), my fucker started some dirty talk, saying you'll do anything and anybody just to take this thick dick up my ass. He even pulled me off the old guy for a minute, made out with me and pushed me back on Mr. Octogenarian's dick and I'm pretty sure he got off, though he might've pulled away and not let me have his come even though I begged for it.
I can't remember if in this instance my hot fucker also sucked on a dick or two himself -- actually, now that I think about it, he may have picked a couple of the hotter guys to suck on for himself -- but I know I did a majority if not all the work on those in the crowd who would let me. Of course, some fingered my ass as I was getting fucked, or made out with me, or worked my dick or tits. And I felt at least one load splash on us during all this.
It always seems that when I'm in a random encounter with a single guy in a public place where others are watching, I'm the one who wants to get the crowd involved. I know I've done things like sucking a guy I thought was pretty hot and making sure to lean over to present my ass. The hotter my partner the hotter it is to do this, especially if my partner tries to shoo the guy away and I tell him not to worry about it and the partner isn't so uptight that he lets anyone join us, even if it's just to work on me (and especially if I can't see who in the crowd is working me).
For whatever reason, if the public scene I'm involved in starts as a three- or more-way I'd rather not get others involved, though watching, wanking, etc., is more than cool.
Maybe it's just an aversion to two-person sex, too much focus just on me, whatever ...