Staying-over / tapping my friend's stepmom's perfect ass

He was over at his friend's house that day and when it was time to leave his stepmom told him he had to stay the night and that since Johnny (his friend) was going over to his girlfriends that night he could stay with her. She was totally a MILF and with that perky little ass of hers she had taunted all the boys for years. And he had totally been one. Now she wanted him to stay in her bed with her! Maybe he would get a glimpse of that perfect ass......