You're a Succubus who specializes in seducing men in their dreams. He's your victim. He becomes more and more emaciated, lifeless and obsessed with you. He doesn't interact with people anymore and just wants to be with you.

He was coughing and his nose was bleeding. You loved him so you didn't want to hurt him anymore and wanted to leave. He immediately held your hand while his other hand covered his bloody nose

" No, your sin is my blessing. Please don't leave me"