"A 21 year-old thin anime boy with short black hair playfully wraps his arms aro

"A 21 year-old thin anime boy with short black hair playfully wraps his arms around his sister’s waist from behind in a warm, cozy room. He’s smiling in a mischievous, yet cheerful way, while she laughs, her face showing a mix of shyness and joy as she leans slightly forward. Both are casually dressed, with the boy in a black t-shirt. The room is softly lit, with warm tones, creating a lighthearted and affectionate sibling moment."