I am not sure how much my T would know about BDSM but I am in the Midwest and it is pretty conservative. I know T would be OK talking about sex/sexuality and I assume if he didn’t know about BDSM he would take a curious approach and allow me to teach him. I am guessing it would be pretty foreign to him and he would have a lot of questions out of concern and lack of experience. (BDSM is a rather complicated topic in my house as I am interested but H is not... but I have many BDSM friends). I can see my T being confused by the after care but not judge it or me. The last thing my T ever wants to do is create shame.
As far as what it is like to picture things in ones head... I have autism so I often get that “oh! You think in pictures”... which I do... sort of... but it isn’t like watching a movie or flipping through a photo album. It isn’t detailed and is often blurry, out of focus, shadows or symbolic.