Moonlit secret: a crempie tale under the garden moon

Under the soft glow of the moon, in a secluded corner of the garden, my young 18-year-old step sister stood, her slender body outlined against the darkness. She was wearing a tight, summer-red dress that hugged her small tits and small waist, revealing an enticing cleavage. Shock flickered across her face as she realized what position she was in - doggystyle, with her small hands clinging to the cool earth for balance. As I watched, I felt a surge, and in that dark place, illuminated by the moonlight, I saw the evidence of my cum seeping from her anal crevice, a crempie forming on her delicate skin.