This dumb idea popped into my head. Is there anything thats like fight club? A guy getting harassed or coerced into doing stuff by an imaginary friend. Im not sure what's funnier, if he knows the friend is imaginary or not. Maybe a straight lead male who is badgered by his childhood imaginary gay friend, who is basically stuck to line of sight of the main lead but can talk and make it feel like hes touching him ( look at other peoples junk in the bathroom urinals or all yell right in your ear all day!/gives him boners at the worst moments) and spends all his time trying to turn him.
Could go all freddy krueger where when the main sleeps his at the mercy of his sadist gay imaginary friend.