SSIS-573 Stealing my sister's boyfriend

Miru likes his senior Yamamoto. But Yamamoto is in love and lives with Miki, who shares the same department with the two. Not giving up, Miru is determined to plan to snatch the person of his dreams. She often wore a long dress, using the excuse of not knowing how to make a report, Miru immediately asked Yamamoto to teach her. Miru kept sticking to Yamamoto's body, she even sat on top of him, holding his cock and thrusting it straight into her pussy in the middle of the office! At first glance, it seemed that Miru was paying attention to Yamamoto's instructions, but in reality, the two of them were secretly fucking each other! However, Yamamoto still has feelings for Miki, he doesn't want to break up with her. Seeing this, Miru encroached even more, and she tried to seduce him even more. The thrill, excitement, and happiness that Miru brought conquered Yamamoto. He agrees to break up with Miki and becomes her boyfriend...