All those tingling sparks that had been running up and down my shaft, the urgent yearning that gripped my cock head (all of which had been almost silent for the last five minutes) suddenly, insistently, and irrepressibly went from mostly muted to full ON. From kindling to conflagration. Splash to tsu...

Oh FUCK! I think I shouted it aloud.

"Aiden?" The worry in Madison's voice was unmistakable.

It didn't matter. I was too far gone. The entire world at once completely destroyed and yet also totally focused on that one key point where my brotherly penis was firmly ensconced in my sister's fertile vagina. The oh-so-dangerous tip of my barrel...