On the night of her 18th birthday, my cousin slips into my bed wearing a sheer nightdress. Blushing, she whispers, “Onii-chan, teach me how to be a woman.” I tear away her panties and devour her virgin slit, her sweet nectar flooding as she moans, “It tickles… put it in.” My cock breaks through, plunging to the hilt, blood and slick juices mixing in a forbidden rush. She rides me with eager hips, tiny breasts bouncing while she cries out in ecstasy. From behind I pound her until her womb quivers, then flood her tight pussy with thick creampie. From that night on, my little cousin becomes my personal cum-slut, begging to be fucked every evening.