it would be best if you could tell the guy seriously what happened made you feel very bad and him slapping your butt or trying to grope you makes you anxious and is not funny at all. after all, he can't read your mind. it's not your fault - i understand why you are upset, i have done something similar at your age.

but he can't know if you don't tell him. your friend may think it's a joke but she doesn't know how you feel.
(and yes, what you described - it is a way of having sexual contact. very peculiar in my opinion, but my partner initiates this quite often

)

twilight
__________________
花鳥風月
c'est tout ce que j'aime