I am 26 now and got into this fetish slowly over time. I was always attracted to my mom but it was when I was in my later teens that I noticed my mom making subtle, one off jokes about liking black men that I began to fantasize her being fucked by other men.The fetish was solidified for me when I came back from school early one day when my dad was on a business trip  that I caught my mom in bed with a black man she worked with. She doesn't know I saw her and I don't think my dad knows but the thought of it continues to get me off.