(incredibly gassy theme) This team needs a hero!

Luckily there's someone right there that can do the job perfectly. Namely, Medic. Maybe convinces Heavy to let him test out some experimental drug on him (it's roofies he intends to later use on other people), it takes quite a bit to get Heavy under but then he's high as balls. Gives Medic the perfect opening to do whatever he'd like to him, and only stopping when it seems like Heavy's about to wake up. Which happens well into the night to the point that even Medic is relieved that he can finally rest now that he's taken as much advantage of Heavy as he can.