If they are forced against each other.

Like when 2 fat guys sit on each side of you

Can it do permanent damage?

Would you feel pain right away because I didn't after 2 fat guys sat next to me on the train

Don't post stupid questions.. .

It's a serious question.

I fell asleep so I didn't know if I felt pain while I was sitting next to those guys.

It doesn't hurt now...
It just feels different.