Can you keep a secret?

I stole two pieces of Lindt chocolates off my brother without his permission when I told him that I won't.

I think I would need to replace them before he notices their disappearance. Logically, I should run down and get it now because he is out of the house. But it's Saturday night when the city comes alive, I'm wearing my pyjamas, my hair looks like a bird nest and I have no make up on.

Hm...