My girlfriend's sister is jealous of me just because of love

Yuki Yudzuru has known the Koyoi sisters for many years, and one day, he started dating her. This was very surprising to Konan's older sister, who had a crush on Yudzuru. Her brain short-circuited with jealousy, and she immediately decided to take action. She continued to seduce him by not wearing any bra in the house, which was very effective. The older sister really seduced him and made him belong to her