Embarassed boyfriend
 

This is for photos where a girlfriend has a nipslip or is showing off and her boyfriend is upset or embarrassed (especially if his friends are there).

more

few more

None of these quite fills the bill, but they all come pretty close:

1. I'm assuming the guy on the right is the naked girl's boyfriend. He looks perfectly content. The guy on the left, whose own girlfriend is cuddling up to him from the other side, looks flustered.

3. The guy's face is averted, but it certainly looks as if the two naked girls are running him to ground.

2 and 4. These are from NIP photo shoots in Czechia, so all the clothed people are likely to be randos. They all look a lot less comfortable than the model, though.

5. It's hard to tell whether these two are boyfriend and girlfriend, but the guy's closed posture makes him seem embarrassed.