I don't think you have anything to be ashamed of regarding your own arousal and that part of you (although wary) enjoys the flirting.
There seem to be red flags on his part, but it's hard to tell for sure from what you have shared.
You say he has said he likes it when you make fun of him and taunt him. I find it hard to believe that anyone feels good at being made fun of and taunted. Why/how did you get this impression? Was this in a sexual context and that's why you got that impression?
I hate to even admit it but at one stage when he was talking to me about sex again, in response to question I turned to him and said "I bet you don't have sex often but rather prefer masturbation" He gave me a cheeky smile on that comment.
Whether he was ever flirting in the first place or he was asking sexual questions for purely clinical reasons, what you say above, is of course seductive/flirting. Nothing to be ashamed of, but I think you need to figure out what's you and what's him. He already gave what sounds like a reasonable explanation as to why he's asked you these questions, but maybe if you ask him directly if he is asking you these sexual questions in order to get aroused; it sounds like you're going to assume this until you hear either way directly from him.
It sounds like you are both aroused and have concerns about the sexual nature of some conversations. Since you say you're 'addicted' maybe you need to think about if it will be productive and healing for you to continue in an atmosphere infused with sex -whether it's coming form you, him or both.
It sounds like you still need more clarity from him. And need to find out if you're misinterpreting messages from him or if he really is being intentionally seductive. Once you have more information, from yourself and him, only you can decide if this is healthy for you.
Good luck.
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