Since this is all very personal I suppose I can give ideas based on how they'd work for me:
- Being gagged for long hours - typically a reward:
- Heavy drooling, bad tasting or otherwise inconvenient gag - becomes more of a punishment the longer it goes on
- Combine with orgasm denial - is a punishment if you really love gags
- A good hard spanking session can be a great punishment, especially if you feel bad about disobeying.
- Punishment for a horny boy/girl - the good old chastity belt. If you can't afford one just be creative. I like the idea of a loose bondage that lets you go on with your daily life but just not reach the spots you need to pleasure yourself.
- Forced foot worship can be a punishment for those who aren't into it.
- Alternatively, deny feet/socks from a foot fetishist unless you want to reward them.
As for challenges, the easiest ideas to come up with are to do things while in bondage that just hardly makes them possible. Try to make it so that a higher degree of success will require a higher degree of discomfort on the slave's part. Something that requires you to go a little bit further while leashed with a crotch rope. If you're not very good with heels - clean the house with high ones, preferably with your hands bound and a dusting gag.
Tell me how well I hit what you're asking and I might aim better in a second post
