Her Master had told her he would only let her cum once she could lie on her back naked, her hands on her tits, her legs spread, with a dildo in her pussy, without the dildo popping out.
She spent long and frustrating days trying to develop strength in her cunt muscles to hold the dildo in, only to see it pop out each time – crying in frustration when the constant process of pushing it in and squeezing it out brought her close to the orgasm she wasn’t allowed to have, making her stop and wait until she had calmed down – until finally she hit on the solution – holding it in with her foot.
It was a technicality, and it might make Master punish her for cheating… but Master would almost certainly punish her by spanking her pussy, and after three days teasing it with the dildo, she was certain she would orgasm the first time he forcefully slapped her cunt… and probably again on every blow thereafter…
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Her Master challenged her to keep the dildo in her pussy...