Student council president can't help it

character: shishido_yui, A full side shot of a beautiful 17-year-old Japanese high school student, Yui, sitting at her desk in a dim classroom during lunchtime. She has long, straight, silky black hair with wispy bangs and elegant, refined facial features, her cheeks flushed with a heavy blush. She wears a crisp white short-sleeve button-up shirt with a distinct school ribbon at the collar and an embroidered school emblem, paired with a dark pleated skirt. Her left hand grips her own breast through the shirt, while her right hand reaches under her skirt, rubbing her thigh and underwear area stealthily. Her expression conveys a mix of intense focus, pleasure, and nervousness. In the background, other female students are napping at their desks, leaning forward with heads resting on forearms. Bright midday sunlight streams sharply through large windows, cutting through the shadowed room, creating dramatic contrast and cinematic lighting in this high-quality, detailed anime illustration.