He fills her ass with his semen

Imagine you come home after a long hard day and your man is there to spoil you. He starts kissing you and his hands move to your butt. He caresses and kneads your ass before kissing it gently. Then you feel his tongue gently glide over your rosette, and you know what he's about to do. He pushes his hard cock into your tight hole and fucks you until he spreads his seed deep inside your ass.