I never actually told my girl I had a fetish. Over time she figured it out. I would tell her things like it made me hard when she took her hair down, I would always have my hands in her hair when we have sex, when she gave me a blowjob I always have it all over my stomach and play with it. I have asked her to please keep it long and grow it even longer if she can, stuff like that. Subtle things.. She knows I love it now and loves that I do. I have also sometimes told her to put her hair up when we have sex. I think she likes to know I'm not just attracted to her hair. Even if I think about it during those times she will never know what I am thinking in my head during sex. I get turned on by her hair bun anyway.. I can't have sex without thinking about her hair but I don't think she needs to know that....