Like many of the others, have rimmed my nephew and I do ATM both from myself, and from my little sisters ass on the regular. Both of us absolutely love it.
One of the hottest things I can remember though was when my nephew and I had just started with anal. He finished inside my ass and filled me up with his cum as usual, but this time he proceeded to piss directly into my asshole after cumming then put the largest of the butt plugs we'd been using to open me up into my ass to plug it all up. We had already planned a family outing right after to the zoo, so my nephew had me walking around with the k*ids all day long surrounded by people while constantly on the edge of an orgasm as I felt the combination of his cum and pee sloshing around inside me and occasionally seeping out down my leg bit by bit. When we got home, he had the cuck lay down in our ensuite shower and made me squat over his face as he slowly removed the plug. I was so unbelievably horny at this point from being on edge all day long that I couldn't help rubbing my clit as the plug came out and I started to cum and squirt almost immediately. Proceeded to absolutely spray the cucks face drenching him in a mixture of both pee and cum from both my holes at the same time. Then at my nephew's request, finished off with a good old smothering of the cucks face and making him d*rink my warm pee straight from the source. I remember thinking then that never in my wildest dreams did I ever think I'd willingly be such a dirty slut for a man let alone be enjoying it as much as I was. Started swelling up with this overwhelming feeling of love as I looked up into my nephew's eyes and for the first time in my life total and absolute satisfaction while my cuck struggled to breathe through my pussy and ass below me.