I can't get rid of the thought... fuck my sister

Because his parents remarried, Yuzuru gained a step-sister. This step-sister of his was extremely beautiful, with a pair of round and enticing buttocks that always caught Yuzuru's eye. Moreover, she always wore short skirts that exposed her T-back underwear in front of Yuzuru, making him struggle to control himself. One time, the step-sister entered his room and complained about her buttocks getting bigger. From high school boys to uncles at the convenience store, everyone seemed to be fixated on her buttocks.

The step-sister had to ask Yuzuru to check if her buttocks were normal. So, the beautiful step-sister brought her buttocks close to Yuzuru's face, with her cute white underwear and the round buttocks that he desired right in front of him, causing Yuzuru to lose control! He immediately took off his pants and inserted his penis into her vagina! And from then on, their twisted relationship began. Despite saying she didn't want to, the step-sister continuously flaunted her big round buttocks in front of Yuzuru, almost as if she was inviting him...