@loki266 @Ainz the philosopher stone from ch.1 doesn't grant new powers, it's greatly strenghtens the existing ones. thus since he reversed time with his power, his power actually manipulates time, not boosts cell regeneration. it's reasonable then, that with proper knowledge of his power he can direct the specific, here biological, matter through a different timeline, changing it's properties. In short, there's a timeline where freia is his sex slave, so he directed her brain in that direction. same with everything else.