After all that -- an epic explosion unlike any I'd ever experienced that had drained me of every last endorphin, leaving me limp and shattered on the grungy floor of the mall -- I'd somehow managed to stay hard. My sister's pussy continued to clasp around my cock.

We were both still stuck.

"Oh, you've got to be fucking kidding me."

"I don't understand," I said, equally confused.

"Seriously, Aiden?!" Madison shrieked.

She pounded her fists on my chest. Did her best to jump up and down like an enraged chimpanzee. My sweet, loving sister was gone; replaced by an insane, raging creature. And yet, was it wrong that I...