I was already in my swim trunks when he came into the locker room and I greeted him. He told me that he wanted to start swimming again regularly. He...was wearing gym shorts, tennis shoes and a t-shirt. I wanted to stay there and make idle chat while he got undressed so I could check out his body, but was too afraid it would appear to be too pervy.In the pool, we were in adjoining swim lanes and each of us tried to outdo the other. He was clearly the stronger swimmer and eventually I slowed. I had never unloaded so much cum to her before the sight of a complete stranger stroking, dirty talking and cumming to her photos on his tv screen just threw me over the edge. This went on for about 3 days cuz on the 2nd day I told him I was gonna go visit her (my family) he asked jokingly "can I tag along" haha I said yea we get her alone and get her horny we can dp her all night. He replied if only I've been dreaming her so many times even been going to the restroom at work to jerk off to. "Put this one me" I said as I handed her my cock ring. She looked confused. "Stretch it around the bottom of my shaft and then stretch it down underneath my balls." She complied and looked back at me. "Now worship that cock." She's a natural so no further instruction was needed, but I wanted to give her more tastes of dominance. "Slower", "Take it deeper", "Grip my shaft harder", "Give me one big lick from the bottom of my balls all the way to the top of my cock", "Now look at me and kiss the. ..............The initial shock of what Mom said moments ago sent me reeling. COUSIN, what cousin I sat there thinking to myself ?Mom continued in a soft voice while looking straight ahead as if mesmerized and said "Cousins I should say..... she has a brother", then I saw her out the corner of my eye look nervously over at me then looked back out the windshield.I was sitting straight up then slumped back in my seat, looked over at Mom who seemed transfixed, then I looked behind me to my sister.