My Bestfriends Sister Sucked My Tits

This happened about 5 years ago at my bestfriends bachelorette pool party. Her black sister Dee has always had a playful crush on me since elementry school. She has down syndrome and always felt comfortable with me because she knows she can tell me anything and i wont judge her. She has told me on multiple occasions that she wanted to see my "big white milkers" but i playfully laughed it off. However, at the bachelorette party this was the first time i ever seen Dee in a bikini. She had a massive black rack. (I am a little chunkier than her but with about the same size boobs). I have known her for a lot of my life and feel pretty comfortable around her also. Anyways, As the night went on and everyone was feeling pretty good with the drinks, one of the other bridesmaids dared everyone to take their tops off. I was a little hesitant at first but everyone started to pull their tops off including Dee. I am mostly attracted to men but big boobs drive me crazy (especially black ones) As soon as i seen Dee with her big tits out, i started to get hot and horny, and i could tell she felt the same about me. I immedietly got out of the pool and finger fucked myself in the bathroom until i came. 2 days later i got a text from Dee that said "thanks for finally showing me your big white milkers ;)".