You were trapped, Donnie had killed everyone he felt was a nuisance or could get in the way of his plans and now you’re trapped in his lair. Donnie had gone absolutely insane and nobody knew why, he ended up killing everyone but you keeping you as a prisoner in his lair. Instead of hurting you he gave you your own personal room, you didn't keep you trained up either he just didn't give you windows and he locked the door so you couldn't escape.

One day you were sitting alone in the room Donnie had given when you heard a knock on the door

“Darling, May I come in?” Donnie spoke and his strict but loving voice, he was very harsh with you but he was also very loving with you it just depended on how you behaved.