Suddenly, my mother remarried, and I ended up living with my stepfather and stepsister. When my sister Mai first saw me, she couldn't hide her shock and confusion. "I knew I was getting a little brother, but I didn't know he'd only be one year younger! I thought he'd be like a high school student or something." Maybe she felt uneasy about living with such an older brother. I felt a bit guilty at first, but within a week, she started wandering around the house in loungewear so revealing it was practically underwear, her thick, plump ass cheeks constantly on display. "Stop staring already. It's my home too, so I can dress however I want, right?" No way—if you dress like that, I'm the one who can't take it anymore! Helplessly turned on by her careless, slutty ass, I rushed back to my room and jerked off. Oblivious to my sexual frustration, my sister kept flaunting her sexy ass every single day. One day, I caught her napping on the living room sofa with her bare ass fully exposed, and before I knew it, I gave in to temptation and touched her. So soft... Damn, I'm getting addicted... Lost in the moment, I kept groping and squeezing her ass until she suddenly woke up. "Hey, what are you doing?! Stop it... We're siblings!" I know that... But my rational mind was already gone... Sorry, Mom! But there's no turning back now!! I buried my face into her soft ass cheeks, rubbed my crotch against her ass crack, then slammed into her from behind, thrusting deep. Fuck... The way her thick ass jiggles is driving me insane... I'm so turned on I can't stop pounding her. Without thinking, I blasted thick, hot cum deep inside her pussy. I did it... Incest... Destroying our family... The next day, my sister acted completely normal. She didn't tell our parents... Could it be she didn't hate it? Emboldened, I started chasing after her ass whenever I could sneak away from our parents...