Found Pics In My Buddys Phone

A few weeks ago I was hanging out with a friend of mine. we're both 23 years old. At some point during the evening I was scrolling through his phone and I found a couple of pictures on it of his younger sister giving a BJ. I asked him immediately and my buddy swears that the cock in her mouth isn't his, but he can't give a credible reason to why he has the pictures or who the guy in the photos are. I may add that his sister is in her mid teens, but not legal where we live.

I was kinda disgusted at first, but the more I think of it the more turned on I get by the thought of it. Lately, I started thinking about asking my buddy if I can have a go.