Even though they're "brother" and "sister," they're still a "man" and a "woman"... You think you understand, but when another man is involved, an uncontrollable impulse begins to stir. Huh?! Something's different about my sister. Her cheeks are flushed bright red, and she's fidgeting down below while glancing over at me. Though she's trying to suppress her voice, faint moans and sticky, wet sounds echo throughout the room. Her expression is somehow seductive, yet also painfully longing.