A secret encounter in the stairwell

In a dimly lit concrete stairwell, an 18-year-old blonde girl with straightened, neat, long dark blonde hair lies on her back. Her dark brown eyes, slightly closed, betray her pleasure as she masturbates. The soft glow of a dark red light highlights her features—small, saggy tits with puffy nipples and smooth, cute skin revealing visible arteries. She wears a dark wine-red long-sleeve shirt, her belly exposed. Her short black-painted fingernails rest beside her, and her round, small ass is visible, labia spread and moist from her own touch. As she moans, a small, wet, circumcised penis presses against her pussy, clitoris engorged, her face showing hunger. Clear discharge glistens, her lips tightly pressed, mouth closed, looking embarrassed yet determined.