So one day I was swinging by my friend's house to try and borrow some clothes and we just had an understanding that we could just walk into each other's houses. So I went inside not figuring she was home but i heard some grunting noises. I let my curiosity get the best of me, I had no clue what I'd find though.

I saw her brother in the bonus room moaning and holding a girls head in his lap. She was bobbing up and down really good and he was telling her she was sucking his cock really well. He was always a crush of mine but I never figured he looked at me so I couldn't help but touch myself watching him getting oral.

He told her to keep going and then he shocked the fuck out of me when he said "fuck I'm gonna cum Tiff" because that's when it clicked that my friend was the one slobbering on his cock. I was frozen and I couldn't stop looking even when she sat up and wiped her mouth and saw that I'd been watching.

She ran towards me and I finally started to head to her room because I knew we needed to talk this through and she explained how this had started a few months earlier and she wanted to tell me but she didn't know how I'd react. She wanted to know I didn't hate her or think she was gross. I had to admit to her it made me really horny watching them and then when I discovered the truth I was even hornier lol.