Hi, no I dont think your a slut or perverted, but I would end this now and show this man your morals. I know he has already started something, but it will end really bad. He probably knows that your attracted to him and wants to take advantage of that, for sex. Since he is older, he knows better. I hate to say this but it kinda sounds like you are being manipulated by him. Have you already made your mind up that you are going to do this?
Try to be strong