I have my strategy. I prepare ist slowly. In beginning I shoot sometimes „accidentally“ just a bit of cum in her hair. This works especially well when she sucks balls. If she does not react bad shoot a bit more on her hair that she sees I like doing this in purpose. If she still takes that easy i just start wrapping her hair around my cock one day. During a blowjob i suddely do it and show her that i like my cock stroked with hair.