[Private to Ianto]

That sounds like a good basis for an involvement to me. Is the love missing on both sides, do you think...?

As to the sex... Under normal circumstances, I'd tell you to stay away, but it sounds to me like you're already having those sorts of feelings for him, so I don't think it would make matters any worse, or you more attached to him. Do you want to be involved with him on that level?