My mind was awhirl with thoughts of what our future held, even as my sister's tongue swirled around the head of my c**k in her mouth. She urged me to come in her mouth, and I did. She kind of shook her head while continuing to suck me back to hardness. Her eyes still held that amused look, telling me what a silly brother I was to think such a thing.
She released my wet d**k with a loud slurp and smiled at me. When she got to the bathroom, she sounded a little perturbed.
"This is the last of the lube," she called out. "We'll have to stop on the way home from the airport and get some more."
"We should see if they sell it by the gallon!" I joked. (They don't, by the way. We checked.)
That was the only night we didn't fall asleep with my c**k in her mouth. It was still buried in her asshol
