My capricious twenty-something nephew gets into my room naked with his cock stiff.

My nephew is very capricious and rebellious. at twenty he doesn't stop chasing me when i stay for the weekend at his house. as soon as his parents fall asleep he comes into my room completely naked and with a stiff cock. until now i had managed to resist and send him to sleep but today it makes me so horny to have him close to him that i can't control myself and i end up fucking his ass by slamming him against the wall.