
Yeah and Mephisto plays as like the doctor that checks up on Leon often right? But remember Nergal's reaction when Leon wore that armor with horns? Nergal couldn't think of anything or anyone with horns cuz he hasn't seen one. So what if(I'm sorry I'm just being delulu) when Mephisto checks Leons condition he doesn't detect the child cuz Cliff is an unknown being to them. And since he's a dragon or sm maybe pregnancy that holds his child takes more than months?

I think it's mentioned that they are basing their guess that Leon can get pregnant on the fact that Leon may be from a race of creatures where a male can get pregnant if they're with someone they love (except they don’t believe the love part). So it's possible that since Leon hates all of them aside from Cliff, Leon may only be able to have Cliff's kid (づ ̄ ³ ̄)づ
What if... The reason why Leon hasn't gotten pregnant no matter how many times they had sex with him was because he had sex with Cliff and is bearing Cliff's child????
(let me be delulu )