IENFH-012 - Studying with my stepsister went wrong: 'Just rubbing' turned into an all-night raw session

While tutoring my sister, she fell asleep in a suggestive pose, revealing her thighs and panties. I couldn't help myself, but when she caught me, she offered to help me relieve myself instead of getting mad. What started as innocent teasing quickly escalated into a full-blown, raw encounter.