My sister-in-law forced me to be unfaithful

She does the chores, or at least she tries. Because in her head, there’s always the idea of making her stepson cum from behind, and I started touching those big buttocks of hers. She achieves it, faster than she always expects, and it will surely be like that for a long time. The boy arrives, sticks his cock in her, and takes care of putting on a condom because he doesn’t want to impregnate his stepmother. Nobody wants that. But then, the slut is left wanting more. She finishes fucking and always wants to put something inside her pussy even more, and she has to complete it with her fingers.