Punishment

I punished 3 guys as they were disturbing very much during the class I make the stood holding their ears in the class as their punishment. They were keep asking sir may I go back to my place then I said.

You will go back to your seat at very last.

Is my sentence correct?

Also - Don't make fun on others if you cannot take it when they make on you.

Is that correct way to say that you should not do fun with others unless you take it.