Kiro is spiked with a drink that gives him tits.

Kiro is a bit gluttonous, so of course he took the offer of a free sugary drink. Little did he know this would cause him to grow tits and shrink his cock. Something told him to take the piercings out of his dick though. He's glad he did. (Don't worry the serum is temporary. The person wanted to prank him not make him a chick. But Kiro also doesn't think this is very funny...)