Bored and horny, I find myself sharing a bed with my stepsister, her massive, jiggling ass teasing me relentlessly. She wiggles seductively, her big tits rubbing against me as she feigns sleep. I can't resist, cupping her ample bosom, feeling her hard nipple. She responds, turning to face me, her big booty pressing against my growing bulge. I slide my hand down, finding her wet pussy, fingers slipping in easily. She moans softly, pushing back on my hand, urging me on. I can't take it anymore, positioning myself between her legs, my thick cock ready to pound her tight cunt missionary-style.