"You suck."
"I- what?"
"You suck."
He splutters soundlessly for a moment. "But why?"
"You're withholding the chocolate."
"No I'm n- Oh." He pauses, staring at the fragment of dark chocolate in his hand. "So I am."
"Give it. Now."
"No." He smiles slowly, slyly, and eats it.
"Mgff!" The other blurts wildly. "Agh, No! My chocolate…" A pause. The look of despair is slowly replaced by determination, and he bends in.
Lips meet, the chocolate smeared on the unsullied.
Then, the tongue, quick as a flash, nabs the melting morsel of chocolate. He pulls away, satisfied.
Sirius groans. "Theif. Bloody wanking thief." he says morosely.
Remus only smiles. Revenge is sweet.