Should I Say Anything?

I woke up to my brother getting his dick sucked by his younger sister in law in a resort room. His gf and I took too many shots, practically blacked out and got put to bed early. I woke up to the sound of his cock being pleasured. He was laying on the resort couch with his hairy legs spread out. It was the first time I have seen him naked and only because there was moonlight shining through the window. There was some serious eye contact and lip movement going on. I’m not sure how his gf didn’t wake up, she must have been out completely. Pretty sure my bedsheets were drenched from me observing. About 15 minutes in they switched positions and I watch him fail to keep her quiet after squeezing his cock in her vagina. I could hear her whisper on about how it was too big. She stopped complaining when she realized she couldn’t catch her breath. They made some scuffle noises and I retreated under my covers thinking the were gonna come over to the bed but shortly after I heard the room door close. I got up and checked the peep hole and saw them walk in to the starewell right next to our room. What proceeded was practically 30 long minutes of my brother stretching out her pussy through an orgasm frenzy. I secretly envied her when I realized he was giving it to her like it was his last day lol. I couldn’t help but play with my clit before they returned. I got in bed and witnessed her walk in with her face caked in cum. She cleaned herself up in the restroom before they went to sleep.