In the dimly lit bedroom, I find myself alone with my sister, the air thick with tension. She's been teasing me all day, her short skirt and provocative glances driving me wild. As she sits on the bed, I can't help but notice the wet spot on her panties. She catches me looking and smirks, knowing full well the effect she's having on me. I approach her, my heart pounding in my chest, and she parts her legs, inviting me in. I run my hands up her thighs, feeling the heat radiating from her core. She moans softly as I touch her, her breath hitching as I slip a finger inside her. We're playing a dangerous game, but neither of us can stop.