Two days ago my sister and I were at home alone. She was in the living room, on the phone with her boyfriend. I spied on her for a while, and I saw her lifting up her short skirt and revealing a fluffy butt plug in her anus!!! I was totally blown away. I managed to take a few photos to jerk off later. She was pissed off when she found out I was spying on her naked ass. She hung up the phone. After quarreling for a while, I suggested that we should do something about that butt plug if she wanted me not to tell the parents. If she wanted to keep it a secret my stepsister had to let me play with her asshole and her pussy. She slid down, spreading her legs so her pussy was right in front of my face! I was looking at my sister’s pussy and her puckered little asshole. When she pulled the butt plug out of her ass she even let me put two fingers in her asshole. After all, her tight anus had to be stretched out for her boyfriend’s cock. Yesterday I noticed her in the kitchen talking to her boyfriend. The butt plug was in her ass and she was not wearing any panties as usual. We started making out on the kitchen counter. Her soft lips were sucking on mine, creating a bulge in my pants. I was ready to fuck her brains out. But when she wrapped those lips around my firm dickhead, I almost went off. But I kept my composure and managed to suppress the splashing. Later she came to my bedroom. She looked so hot in her black thong and bra. But she quickly got fully naked. I licked every single inch of her intimate parts, including her soft, tight, delicious ass. It really got her going, and the next thing I know is that my rock-hard dick was in that pleasure hole. Anal sex was not new to her. She already had a lot of skills. My beautiful naked stepsister bent in the right direction, allowing my cock to penetrate even deeper into her asshole. Once it was balls deep, I started pounding her as hard as I could. She screamed and moaned, but I wasn’t stopping. I kept fucking that sweet, tight asshole for a couple of hours.