I'm a virgin who's been stuck in this state for too long, so I beg my step-sister, who is kind but treats me like a child, to "let me have sex with you!" But my sister tries to brush me off with the composure of an adult, grinning and saying, "It's a dangerous day. You can't do it." But! But! I really want to do it! When I forcefully attack her, she gets really flustered, but she gets more excited than usual, enjoying the thrill of maybe doing it. But when I come out at the last minute, my sister gives me an unsatisfied look...!