You seem to be in a sticky situation. l suggest that you don't do what he's telling you to. Violating him further will only reinforce his belief that this is the only way to relate with others, find love and acceptance. Instead, Show him healthier and respectful ways to relate with you, express love and acceptance.
Next Steps
He needs to visit a psychiatrist and counselling psychologist to heal his trauma and learn to lead a "psychologically healthy" life and relationship.
Health Tips
You need to know and assert what your relationship boundaries are and stay within them even if he puts pressure on you to rape him.