Ah well... [That's complicated.] The Master is the one Fuuko works for. He's very kind and considerate to Fuuko and lets Fuuko stay in his kitchen. But this isn't the Master's kitchen so... [You see why she needs to get back now? Wrong kitchen.]

Teacups don't have masters, they have owners. Fuuko wasn't always a teacup though, so it's a special case.