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I mean… I think we can all agree that boobs are at least universally non-threatening, even without counting the symbolisms of nourishment, nurturance, life, fertility, etc. At least I don’t think we’re at the point where hiding machine guns or hellish snakes in boobs is viable. … Right?
You should watch Austin Powers. Machine gun tits back in the 90s, lol.
Bring in the fem- BOOOOTS
Also Mazinger (may be known under a different name in some countries). One of the robots (Aphrodite A) had titty missiles: https://tenor.com/en-CA/view/afrodita-aphrodite-mech-anime-gif-16897967
Alternatively the second era of mistborn has a woman hiding weapons in her tits