She gasps and comes, stills on top of him, kisses him and says "I had a great time," and is replaced by someone else.

That was unexpectedly sweet. Bruce is having a great time too, and hopefully so is the someone else. Maybe this time he won't try to fight off an orgasm, if only so he doesn't literally melt into goo. (Hey, it could happen. Maybe the Erogame secretly wants to feature a goo monster. Hopefully not though.)

The other person is riding him very enthusiastically and making happy moaning noises and all he has to do is lie back and close his eyes and feel good.

He can do all that and add his own happy moaning noises and it feels so, so, oh so very good.

And once they're both done he can just lie on the floor and drift for a while.

The orgy considerately moves about eighteen inches away from him so that he does not have dicks in his face while he's drifting. 

That's nice. Maybe he can roll slightly out of the way and watch until he thinks he can get it up again.

"Hello," says a voice. "What are you up to this evening?"

Eh? Oh right, language, humans use it.

"Hi. Same thing as everybody else, basically."

"Care to be up to it a little more?" the man says, running his hand along Bruce's torso.

Ten minutes ago that would have been a very nice sensation; now he's simultaneously half-unconscious and hypersensitive and doesn't have nearly enough brain to process all the input he's getting, let alone come up with a polite form of "maybe in a few more minutes". Instead he twitches and makes a meaningless noise.

The man seems to take it as a yes and kisses him. 

It's objectively just a kiss, but it still feels like too much all at once and he just sits there unresponsively. Maybe he should have dozed a while longer first. Very bothersome that he still finds parties overwhelming before they're done.

The man gets on top of him and pins him down and kisses him.

Being pinned down is objectively less restrained than being tied to a bed, but he was having a hard enough time moving without that, and also it's slightly more effort to breathe now and it adds up to kind of unpleasant. He tries squirming sideways a bit to indicate that he wants to switch to side-by-side, since his mouth is still occupied.

The person on top of him does not seem to speak Wiggle. 

That's very inconvenient, because Bruce doesn't seem to speak English!

The person on top of him reaches between his legs and starts to stroke his dick.

Apparently he can get hard again, now, but it's still too much at once especially with the weight on top of him. He makes some more incoherent noises about it.

The person on top of him pins his wrists to the ground and starts grinding on his dick. 

Well now he can't move his hands, and suddenly it's very hard to move any of the rest of himself, and not all of his trouble breathing is from the pressure on his chest, and he's scared of he doesn't know what and confused by his own fear and very aware of how exposed and vulnerable and naked he is. He thinks, distantly, that if this is how deer feel when they freeze on the highway and get hit by cars then he doesn't blame them at all.

"You're fun," the person on top of him says, and sinks down on Bruce's dick. 

Come on, brain, he's getting fucked, this should be nice. Bruce tries to even out his breathing and enjoy himself, with mixed results; it still feels like he has about twice as many nerve endings as he ought to and none of them know what signals to send.

The man gently caresses Bruce's chest. It feels like a threat.

Bruce shivers and makes another attempt to pull away. He should say something, explain what the problem is, but he doesn't have words for it and couldn't make them come out of his mouth anyway.

Eventually the man comes with a gasp and gets off Bruce and disappears into the rest of the party.