His intentions start off pure until she awakens something inside him
Gary is somehow bothered by a tramp sleeping on the streets in London and wants to help them. They turn out to be a pretty teenage girl.
Unable to send her back to the street after feeding her he takes her home with him.
It very quickly becomes apparent she is a natural submissive and likes to be told what to do. Gary finds his dominant streak that has been buried all his life coming out and so begins a relationship of her more than willing to please him and him wanting to make her his to do with as he pleases.
Despite being on the street for two years she is still a virgin and wants Gary to have her precious gift, but he makes her wait while she is tested and it is safe to take her without protection.