On the other hand.

Peter's just going to shut his eyes for a bit and let the conversation happen around him. It's kind of anthropologically interesting, the way other people's natural social scripts, when he's not injecting artificial complexity into them, are so extremely limited. They're not capable of a ton more than this, demonstrably, but any, and so it's wild to him that they don't even go to that limit on the regular. 

Maybe it's a personality thing. Most of the people he's met so far haven't really been scholars, exactly, so perhaps nerds would behave more like everyone does when Peter is personally trying to extract interestingness from them. He doesn't know.

A couple more of his fraternity brothers show up while Peter is not-exactly-dozing off and join them. They express mild surprise and dismay that the three people already in the jacuzzi are nude and then proceed to not give any more of a fuck about it.

Yes, because, you see, they were programmed to react with some alarm to nudity in unexpected contexts but not to really have a principled internally-consistent objection to it crossed-out only because Peter feels mean for thinking it, not necessarily because he thinks it's exactly false. Like, they presumably weren't literally programmed (though what does he even know), but it sure doesn't feel like they care.

Of course, having that thought doesn't actually stop his cock from stirring a bit at the idea of the two new guys wearing swimsuits while the other three are naked, but that excitement is short-lived. He's really tired.

Eventually they start to decide it's getting late and they should leave, one by one.

Yeah, legit. Peter should actually get something to eat, too, he grabbed a little bit of food back in Ravenwood but it wasn't much and he's hungry.

(Why does he even feel hunger? Maybe it's because he's a discount ghost rather than a real ghost. That'd make sense, it wouldn't do to neglect his physical form just because it was temporarily not all that physical.)

People continue not to really notice that Peter's a ghost.

He didn't really expect them to. It's whatever. He'll just continue not to expect things and then he won't be disappointed. That's how this works, right?

Anyway, he eats some stuff, timeskips over doing some homework, then goes to bed. Hopefully he'll be mortal again in the morning.