Listen hear me out HEAR ME OUT
Giving a priest a tattoo.
Something small, something easily hidden from his flock. Maybe a snake on his ribs, maybe a dice on his thigh. Nobody else knows it's there, except you, him, and most importantly, God.
Tattoos have literally been around since at least Otzi the Iceman. There's no way getting a tattoo is sinful, the church just claims it is because it's The Catholic Church (see: The Crusades). It's about power, control, and that's exactly what it is now, as I put this needle in your skin.
Maybe it's done with a gun, but it's much more likely to be a stick and poke. Sit still Father, you'll mess up the design, then I'd have to start over, wouldn't I? I don't want to have to tie you up. Are you crying? I thought you were a big, strong, superior man of God. You can't handle a little needle? Christ took three nails, you can handle this. Yes Father, say that prayer again, it always gets me hard.