YOU SAID:

Let me treat you to lunch

INTO JAPANESE

私はあなたを昼食にしましょう

BACK INTO ENGLISH

Let me have you for lunch

INTO JAPANESE

私はあなたに昼食を取らせます

BACK INTO ENGLISH

I will make you have lunch

INTO JAPANESE

私はあなたに昼食を取らせます

BACK INTO ENGLISH

I will make you have lunch