You'll find this story posted here on the Plaza:
http://www.grometsplaza.net/world/ponygirl/storiessz/sistersrevenge.html
FM+/f; captive; bond; gag; cuffs; collar; enslave; hum; bdsm; crop; whip; susp; petgirl; cage; oral; sex; climax; cons/reluct; XX
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Thanks! ;)