<human>: Can you summarize the given text in a few sentences?

My girlfriend lives with her male cousin. She and I are 22 he is 29, he always acts weird around her -  does things that puts red flags up in my head... like hugging her for too long and the like. I always just assumed I was crazy... they are cousins after all.

Recently he left the house to go on errands, thinking that no one was home. I had slept over, and was waking up. I went into his room to grab something I left there, and on his computer monitor was a facebook picture of my girlfriend  (his cousin)  In a bikini, with handcuffs photo shopped in, and a gag photo shopped onto her mouth.

Obviously this is more than a simple crush, and it is freaking me right out. What do I do in this situation? He doesn't know I know, and she sure as hell doesn't know anything. What do I do?
<bot>: My girlfriend (22)'s cousin (29) wants her sexually. I found photo shopped and sexual pictures on his computer. WTF do I do - if anything?