A little humor in porn is only a plus.
This guy who is tied up, he appears in many videos, I think, as this simpleton who gets cheated on by his girlfriend. Just look at his face, it simultaneously expresses frustration, helplessness and cowardice. I wouldn't be surprised if, after the lover left and the girl untied him, she only had to say a few sweet-faced phrases for this cuckold to forgive her.
Well, if they're friends, they're allowed! What if she needs help in the future, or will be bored - they can always pull. The main thing is for her boyfriend to enjoy it.