My two cents, from a switchy gal who has a sub who likes to top from the bottom... sometimes...

Physical punishment for him is a reward. Putting him on cd or making him wank until his dick falls off is a reward.

One thing that worked for sure, was making him stand silently in the corner for 20 min. He couldn't do 10. So, he whined and wanted an alternative punishment.

Of course, I clucked and was the understanding mistress, but, I gave the bitch a choice, 30 min. in the corner or write a 500 word essay on any topic I wanted.

*gg*