Harry and John are trapped together (possibly with Hendricks nearby, for extra voyeur fun), and Harry has been dosed or bespelled with something that removes his inhibitions and makes him act on whatever he's feeling. At some point he tells John that his choices are to kiss John, punch him, or SET HIM ON FIRE, now which impulse would John like him to follow?

What I'd really like to see is Harry choosing to act on his repressed lust in order not to kill John with his uncontrolled anger, and John going along with it. Yes, this is dub-con and fuck-or-die. :D

Bonus points if Harry comes dangerously close to killing John in a burst of rage, and John is turned on by the danger and Harry's power.