Tiny problem

Me and my girl cousin are very close. One day while watching anime together, she fell asleep on my thigh while facing on my cock. I couldn't help but get a boner because she looks so defenceless (she is just wearing t shirt and panties). I started rubbing my boner on her mouth trying to put it in, i even tried reaching for something so i can put it in further but after some few minutes she turned around. Now i cant help but fantasize about it and wanting to do it again