"Listen to me, Blossom. I'm not trying to force you into this, but... You don't have any choice anymore. The contract has already been signed, and none of us can change that. If you don't fulfill the contract—... well. Let's not talk about that. How about you sleep on it? We'll see tomorrow."
Or: Tsuna becomes a magical girl/boy, and the rest of the world wonders just what is going on.