Is it normal my bf sleeps with his penis between my butt cheeks?

My boyfriend and I sleep naked together at night, and my ass is really tone and rounded. He obsesses over it and loves how big it is. At night when I'm asleep I sometimes wake up to him just sticking his penis into my butt crack. It's not actually going inside of my asshole, he just positions it so that my two ass cheeks smother his shaft. It's like a hot dog positioning. I just pretend I'm asleep when he does this and I just let him sleep with his penis in between my ass cheeks. Sometimes he sticks his scrotum in between my ass cheeks so his balls are smothered too. I'm afraid if his balls stay there during the night it might hurt him since they are kindve getting squeezed by my ass which is way larger than his testicles. One thing to add is that he is middle eastern and I am white, and he says middle eastern women don't have nice butts. He also likes that I'm a white girl with a big booty. So he loves mine and says its big and round and he wants to try anal sex. I would let him try it with me but I'm just wondering if he should be this obsessed with my ass?