I took my time rimming my sister's anus, worshiping her secret entrance with my tongue, licking her sphincter into relaxation, enjoying her whimpering encouragement. Didi always liked my analingual ministrations when I went down on her, and it thrilled me a lot to do it, but this time was special. This time I knew I would fuck that pretty pink hole after servicing it with my mouth. The thought of having anal sex with my sister had me so hard that my cock stood perfectly vertical against my abdomen, it was so stiff I feared it might snap in two.

Didi's fingers kept circling on her clit as I ate...