I read ST a hell of a lot - probably too much if there is such a thing. I learner about masturbation here. I also read the 'family' stories. They turn me on so much but, so far at least, I haven't let anyone in my family actually touch me. (Sorry, this is getting long-winded).
I have a younger brother who I used to tease when he got into puberty. I guess he was about 15 and I was 17 when this happened.
We had been talking about stuff in general and I guess it had turned to talk of sex. He had asked me if I had been the whole route yet (no) and I asked him if he had (NO!) Then he asked me about if I played with myself, and well, I just felt myself cream up! So I said 'Yes' and asked him the same. THen, for no other reason that that I wanted to, I spread my legs. I swear we said nothing and did nothing, but his eyes were fastened on my wet panties and I felt like I could feel his gaze. We must have sat there for half an hour, me with my legs spread, him staring (and with a huge erection) I got wetter and wetter and my clit was throbbing fit to burst.
I learned that it is the kinkiest thing in the world for me to just let him stare at my crotch. When he left my room, it took just two tiny little strokes for me to cum in my panties.
Over the next few months we varied it. I would stare at his erection and it would produce pre-cum without him touching it. He would stare at my naked pussy sometimes too and I would leak onto the chair.
It led to us masturbating together but we didnt touch each other. I guess its a strange 'technique', but it was the most erotic thing at the time.