I really want to be spoiled but can't be honest with my sensitive, busty step-sister begs and seductive words

Mei and Naoya suddenly become a family after their parents' marriage. Mei, a female college student, treats Naoya in a slutty and uninteresting way when she was a child, so of course Naoya wasn't aware of Mei as a woman. However, Mei actually loved Naoya, but she couldn't be honest because she was worried about what others thought. However, when they are alone, Mei gains courage and tries to excite Naoya with naughty words for various reasons. Naoya gradually began to pay attention to Mei...