Numb masturbation

Thought my luck had changed this morning, wife came in to my office in dressing gown, asked me if I wanted to wank over her ass for 2 minutes, I of course said yes, first offer in a month. As she undid my chastity tube, my cock became hard almost instantly, incredible sensation as the blood forced it's way in, I had a diamond cutter in less than 5 seconds. She got out a small tub of what I thought was lube, put on her latex gloves and smothered my cock in the white cream, all the while saying how I had to enjoy this as it would be the last one for a while, the sensation was incredible. Then she turned, bent over my desk and lifted her dressing gown, legs apart. "Start" she said. I thought I would blow my load in no time, she was wiggling her arse and arching her back, taunting me, telling me she wanted my hot cum up her back, but the more furiously I wanked the less and less I felt, until I could have been touching someone else's cock for all the sensation there was, my cock was so hard and shiny, and I was desperate to cum, but even with her arse spread, 2 inches from my throbbing cock, there was nothing apart from pre cum. Then suddenly - "times up!" She dropped her dressing gown and turned pouting "I thought you loved me and thought I was sexy - but you can't even cum after a month, how long shall we leave your chastity tube on this time? 2 months?" I started to apologise saying I didn't know what was wrong and of course I thought she was sexy. "put this back on" she said with a hard grin. There was no way that little tube was going to fit, my cock was still like a rock. "OK I see your problem, turn around and spread your legs". With a sinking feeling I turned around, my turn to spread my legs. With no warning she booted my dangling balls - I dropped like a stone. "stand up you fucking sissy if you know what's good for you", I staggered up. Again she booted me again in my already swelling blue balls. "Now turn over - ah well, that seems to have solved the erection problem" She slid my chastity tube back over my now shrunken cock and clicked the lock back into place. "2 months this time" she said and walked out.
Now I know what K creme does.