Brianna reached over and put her hand on Jenna's. Like they were about to ride the rollercoaster rather than ride their brother's dick.

"You heard your slutty sisters," Amy said, "Now be a good big brother and give it to them."

Like I'd needed any encouragement in the first place. I knelt down, my cock aimed between the two of them. Their mixed scents filled my nose. Strong and sweet. I made a last minute decision and steered my dick over into Jenna's sopping snatch.

"Oh YES!" she cried, a bit of sibling rivalry seeping through. In the interest of being fair, I reached over and started stroking Brianna's pussy...