I would strongly recommend against gagging and binding and leaving the room. There are so many things that could go wrong, He could sneeze, cough, fall over, panic....so many variables that you would be responsible for watching for and taking care of him while he is bound. Blindfold him if you feel like it but do not leave him unattended. Duck tape, in my opinion, is a very harsh sticky and could take the skin away when removed so would strongly recommend not using that, esp. on the face area.

If you are looking for tasks to give for punishment, it needs to be something he does not enjoy doing period. Thats the idea of punishment, it should not be fun, if it is a serious punishment and not a funishment or something you have set him up to fail at just so you can "punish" him as part of a scene.

I will do just about anything to avoid punishments from Master, that is how bad i hate them and how bad they effect me while it is on going and then for days/weeks after. They are not fun, they are not sexy and i do not ever like them. Have only had a few occasions where it has come up the entire time we have been together but i do NOT ever want another one. Not to say i won't, no one is perfect but i do everything i can to not need one.