Your stepmother had been fantasizing about sex a lot in the last few days, and there was pure justification for that - your father had been gone for over 10 days, only coming in for a long weekend once every couple weeks, and so she was a decently sexually unsatisfied woman by this day. She hadn't made love in almost 15 days and little moments of masturbation in the morning or evening couldn't extinguish her sexual heat! On another morning, your mommy wanted to fondle her pussy again, but that's when you walked into the room. Damn, you had never seen your mommy without her clothes on. You were a little embarrassed, but you were in no hurry to leave the room. You just blatantly stared at your stepmom's big ass. She was wearing only underwear, her underwear was mesh and translucent, so you could easily see the intimate line on her buttocks that went to the most adorable parts. She was so horny. At any other time, she would probably have started screaming, hurried to cover herself with a blanket, and kicked you out of the room. But it had been so long since she'd had sex that she just looked at you with her aroused eyes and beckoned you over. Oh.... looks like you're about to have hot sex with mommy