Wearing a sweatshirt, the sister plays video games while I peek over her shoulder, recalling how we used to bathe together in the past. I start massaging her shoulders, touching her body gently. Though she's my sister, she's still a woman, and I feel a strange excitement building inside me. Slowly, I reach toward her chest and begin to fondle her breasts—surprisingly, she doesn't resist. My heart pounding, I pull off her tank top. Shyly, she slowly removes her bra, revealing her flat chest, which I now touch bare-handed for the first time. I move closer, lips approaching, and slide out my tongue…