A short band of large anal beads, 2-4 beads. at the very ends of each bulb, a portal device. Just insert one bead inside and anally fuck someone, either a constant inward motion, constant expulsion, or pistoning back and forth, the beads moving in between both portal ends inside and outside the ass. For even extra intimate fun, get two devices between two persons, and switch portal ends. Every-time beads goes inside one person, the same beads go out the other, and vice versa.
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