I stumbled upon a solo masturbation session with my sister's guest and seized the opportunity to satisfy her with my large manhood

After a night out, my sister\'s friend crashed at our place. Left alone, I stumbled upon her pleasuring herself. Ignoring my presence, she continued her solo session. Seizing the opportunity, I joined her, taking charge and filling her with milk, fulfilling my fetish. A wild, amateur encounter ensued.