I caught my sexually adventurous sister pleasuring herself

I stumbled upon my younger sister, a college-going girl, indulging in self-pleasure, her fingers diving into her wet folds. Initially taken aback, curiosity took over as I remained unnoticed. She's a shy girl, but with a hint of sexual adventurousness. I couldn't resist the urge to join her. We chatted, and she revealed her naughty side, eagerly agreeing to continue our intimate session. Her petite frame and natural tits, adorned with a piercing, were irresistible. I began to touch her, teasing her sensitive areas as she moaned in pleasure. I could see her panties dampening with anticipation. I undressed her, revealing her perky nipples and shaved pussy. I teased her some more, driving her wild with desire. She eagerly took my throbbing member in her mouth, skillfully sucking and stroking it. The sight of her small breasts bouncing as she rode me was mesmerizing. We both reached our climax together, leaving us both satisfied and breathless.