Sometimes a slave just can't get it right!

There are some things I know Master really likes and I try to do them occasionally without being told to - dangerous for a slave, I know, but what is life without a little risk?
Last night Master tied my hands behind my back and gave me a short sharp caning while I was bent over the back of a bedroom chair. He likes to fuck me when I'm struggling to keep my weight off my burning backside. So far so good!
After He'd had me I turned on my side and grasped his cock in my bound hands because I know full well that nothing, well almost nothing, revives him quicker and that He'd want to have me again. But what with the combination of my softly caressing hands and hot bum, the next I knew was that I had a handful of sticky cum to deal with. Master was not happy and bound my elbows together to ensure I passed an uncomfortable night. He also awarded me 50 strokes for punishment.