Part 2 of Cabo with my sisters 19 yo bf

I posted the first part of what happened in Cabo. But here’s what happened night 3. We had been at the pool all day with the fam. I went back to the Casita that my sisters bf and I were sharing. Earlier that day I realized my pubes were coming out of the top of my suit so I thought I’d trim them. My sisters bf brought his mascape trimmer so thought I’d use it. Our bathroom doesn’t have a door on it so I went into the shower and started trimming my pubes. He came into the room and heard me in the bathroom and asked if I was using his ball trimmer. I started laughing and said yes. He came intro the bathroom to pee. When he was done he peaked around into the shower area and said “dude lemme help u out”. I had seen his hairless ass and balls the day prior and he seemed to know what he was doing. So I laughed and said sure. He came into the shower wearing his swim suit and told me to hold my dick up. He started shaving my balls and shaft. He was very focused. Towards the end of shaving my balls, he started rubbing the shaved hairs off my balls (which felt really good tbh). Then he said “dude u gotta get under ur taint and around ur ass”. I said “aight dude” and he said “lean on the back of the shower and put one leg on my shoulder” - he was kneeling on the shower floor. He shaved my taint. Then he said “aight bro, turn around and bend over” I started getting a bit of a chub at this point. He says “btw you got a great cock my bro!” I said thanks - knowing he likely didn’t remember that I saw his entire naked body the night before. I said “ur defo bigger than me” he said “nah bro. Ur a god”. So I turn around and he spreads my ass with one hand and starts shaving the inside. He turns on the hand shower head and rinses it off and runs his hands thru my ass crack and says there’s still a few more to get, he shaves a bit more. At this point I’m rock hard facing behind him. He rinses off my dick and notices the boner. “The most important part is putting lotion on after - I got u bro” he said as he grabbed the lotion from the counter. I stood there as he applied lotion all over my balls, taint, and ass. He told me to bend over a bit more, so I did… he shoved his finger up my ass and started laughing. He washed his hands then I dried up. My sister nocked on the casita door. He answered it and asked if they could have the room for a bit. I left the room. I spied thru one of the windows and saw him eating her out and then he slid his cock into her ass. He’s an ass dude. It all makes sense now.