I, an only child, suddenly gained a cute and well-endowed younger sister who is clearly timid. She gives off a vibe that makes it seem like something might happen, so I brazenly engaged in sexual harassment! I couldn't bring myself to firmly refuse. This is going well! It's definitely going well! Thinking so, I attempted to kiss her, only to be unexpectedly rejected. I pushed past her defenses and forcefully kissed her without giving up...