For the first time his girlfriend lets him fuck her ass

The couple is fucking in bed and they're both very horny. The girl loves how the guy fucks her and the guy has an idea. He asks the girl if she will let him fuck her in the ass and she accepts for the first time! The boy lubricates her ass and sticks two fingers in it to dilate her. Then he sticks his dick in her and can fuck her a couple of times, but the girl is in a lot of pain. The boy is left wanting to stick his whole dick in her but he's sure there's going to be another chance