I need this so bad. Like Graves expects the worst but Grindelwald just tells him to remove his tie or something to leave his throat bare so maybe Grindelwald stares at it like he can still see the finger shaped bruises that were there and Graves is left feeling exposed.
Like small things like that or rubbing a thumb across Graves's lip or just touching his face which is super intimate but not quite sexual. Or makes Graves show him his wrist where there are scars from his imprisonment, nothing Graves can flat out reject in the face of information but things that can stack for some major mental strain.

Ahem, err whatever suits anon's fancy. Anon has a creeper kink