Everything Hydra has done to him has left Bucky with a confused and reluctant fetish for hole punishment. He can only get off if someone's hurting him: fucking him with oversized dildos, spanking or whipping his hole, fucking him with stun batons...

Bucky is ashamed and angry about his own desires, but he also really wants to get off. Thankfully, Steve is willing to help him out.

Bonus point if Steve, for his part, is ashamed about how much he's into it.