Mi casa es su casa spoken language
The expression originates from Spanish, and it is a friendly and common saying to welcome people visiting one's house.
The saying means "make yourself at home".
A: "It's raining heavily outside. Would you mind if I stayed at your home tonight?" B: "Of course not. Mi casa es su casa."
Come in and join the party with us. Mi casa es su casa.
If you swallow the bait, you take something that someone offers you, or agree to do something that someone asks you to do without knowing that it is a trick or way of getting something from you.
You can't just do whatever he wants you to do. Don't swallow the bait.