HUNTB-217 Rotor Left Inside Sister, Unstoppable Convulsions, Creampie Multiple Times

A brother secretly inserts a rotor into his sleeping sister, who masturbates with one every night, and when she wakes, she asks for piston sex with the rotor still inside, leading to convulsive orgasms and repeated creampies over the 216-minute runtime. The violent piston and ramping rotor overwhelm her pleasure center, and she rolls in ecstasy.