And so I taught her, my little sister kneeling at my feet with her hands on my thighs and my cock in her mouth. I showed her how to turn her head to vary the angle and how to adjust the tightness of her lips to draw out the pleasure. She watched herself in the mirror, her mouth full and her throat moving as she tried to take me deeper and she moved her tongue to curl over the sensitive skin of my glans as it slid, slippery smooth, against the inside of her cheeks. My hands were in her hair, guiding her, holding her as I worked my cock...