Writing "Steve gets Tony high" you naturally have to listen to "Reefer Madness".

I want Tony flirting and thinking he's proposing shocking things (that are really fairly tame) to 'innocent' Steve to get him flustered -- only for Steve to totally turn the table and propose waaay kinkier things (seriously) that get Tony ruffled.

Preferrably Tony gets into it after he gets over the shock.