The older sister I always bullied accidentally exposed her perky ass while cleaning the bathroom and gave me panty shots under her short skirt, making me instantly erect. Noticing my reaction, she grew increasingly frustrated, unable to suppress her own desires, and secretly began masturbating. One night when our mother was away and we were alone, we started showing each other our masturbation, fueling our lust further. Despite being siblings, this forbidden relationship heightened our excitement, and before long we crossed the line, engaging in full sex.