Marry
You meet a woman whose mouth is big and you instantly know this is the person you want to marry.
When you think about the person you want to marry, picture their mouth wide in a big, beautiful smile, a wide-open laugh. That's the lady for you, alright!
いん
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You marry this woman right away and you both go straight to an inn (いん) together!
When you get to the inn all you do is make her laugh and smile so you can bask in her bright, big, mouth smiles.