[If he ever finds out he'll lowkey detest her for the rest of eternity.
"Calling it 'enchanted' would imply magic is involved", Sebastian's inner monologue snarkily responds. Outwardly, he still smiles and answers pleasantly:]
The person who made it mentioned a spell was needed, yes. I don't know the specifics of it, I'm afraid, as I know precious little of powers of this kind. It isn't my own creation, you see.
[And still he just accepted it? Granted, it's because Sebastian is very confident he'll be able to do something about the broom should it suddenly go rogue, or something.]