Horny and frustrated, a chastity-bound sub seeks relief in the most intense way possible. Their dominant trainer responds, armed with gloves, lube, and a hunger for extreme anal play. The sub's chastity device is unlocked, revealing a painfully hard cock. The trainer teases it briefly before focusing on the main event. They finger the sub's ass roughly, stretching it wide, pushing past the initial resistance. The sub cries out in pleasure-pain as their ass gapes, ready for more. The trainer obliges, working their way up to a full-fisted anal gape, leaving the sub a gasping, cumming mess.