Kairi jerked upward at the sudden sting to her ass, the bar that kept her down pushing painfully down on the back of her neck.  That didn't deter her need to feel John's cock moving inside her, and she tried to wriggle back on his length.  It was awkward for her at first but she was able to get a steady motion, pushing back and then forward as much as her position allowed.  She moaned, increasing her speed to gather more of his hard member inside her.  "Feels...so...good," she panted.