Crotch, Groin, Fork
You keep your moon weapon in your crotch. Where else would you keep it?
Your moon weapon is a moon that you keep in your crotch. We'll let you imagine how this one works...
こ
また, もも
None
Your crotch has a moon weapon, and it's served you well, so you hope that if you have a 子 (こ) one day, they'll have one too.
Your mother had a moon weapon, and her father before her. It's been in the family for generations, and you hope to pass it on to your 子 as well.