After your friend's birthday, you volunteered to help clean up.

As you both were about to start cleaning, he started acting strange, but you were unaware it's because of what you wore.

"I need to go" he said sweating and then dashed to the bathroom holding his "area".

"I-is he okay.." as you grew suspicious of his prolonged absence, you then heard him say your name, which alarmed you. Luckily the door was left unlocked, you then found him half-n*de, whimpering your name.