Yo my son is all about the couch fort, but being an only child means either friends gotta come over, or dad has to squeeze in.

Buy cheap sheets and staple them to the ceiling around a bed or couch. Similar vibe, big enough for an adult, and easy to set up and take down. That's what I've been doing for years when I feel a mental disaster day creeping up. I'll also grab some lunchables if I know I'm going to be in the thick of it for a while

I'm still the height of an average 12 year old, I'm good!