I like to be jerked off while he fucks me in the ass

I like that my boyfriend masturbates me while he puts his hard cock up my ass, I love to get on top of him and that he puts me like that from behind; not all, but it is nice enough to feel the little tip entering my anus while he holds my member and keeps it very hard. I could run like this at any time, but in the end it's him who does it on my thighs and lets me finish the job myself.