Her door was already ajar, but swung open a bit more as he stepped into the doorway. Mike gasped as he saw his sister, lying on her bed, her legs spread eagled, her fingers plunging into her pussy, toying with her clit. She might as well have been naked, because her gown hid nothing. Her head was thrown back, her back arched, her breasts thrust upwards. Her eyes were closed, but her generous mouth hung open, her face flushed. Mike stood staring, only his cock reacting to his sister. .....