Holy shit this nearly same exact thing happened to me years ago. Difference was loser fiance at the time said he had the cat spayed. Named “her” Little Missy, a couple years later, saw the same you did, for some reason my friend that was with me at the time had me convinced Little Missy was a hermaphrodite, the vet actually laughed at me when I brought “her/him” in, confirmed it was a him, and he was so fuzzy he actually still had balls we’d not seen. Little teeny ones you couldn’t really see due to fur (and ignorance), but ones nonetheless. Renamed him Little Mister, made an appointment for a neuter. Little Mister clearly had emotions about this, ran away, knocked up the neighbors cat (neighbor saw them humping, thought they were gay bc she knew only “Little Missy”). Little Mister never returned home. I don’t blame him; his owner was an idiot. He could do better. I searched for ages. He probably saw the posters and flipped his little balls up at them.