Femdom domination at a BDSM fitness club over Mister Bob the instructor experiences orgasms in a vacuum bed鲍勃先生决定在夏天减肥，于是开始寻找一家合适的健身房。他看到一则广告，承诺快速减肥，但细则里也写着一些附加条件。他找到了那家健身房，那里的人们正在等着他。他的教练对鲍勃先生非常严格，有那么一刻，他甚至想回家。

但他突然想起自己带了一根弹力带，结果发现那竟然是他的真空床。他决定给教练示范一下如何正确地锻炼，才能在锻炼中获得快感和高潮…Mr. Bob decided to lose weight for the summer and started looking for a good gym. He came across an ad promising quick weight loss, but with some caveats in the fine print. He found the place, and they were waiting for him. His trainer was very strict with Mr. Bob, and at one point he wanted to go home.

But he remembered he'd brought an elastic band, which turned out to be one of his vacuum beds. He decided to show his trainer how to exercise properly to experience pleasure and orgasms from his workouts...