For getting rapidly bred to the point of getting quadruplets, her tummy sure didn't correspondingly look huge, that's just kinda the same fkin size as Kokutou Nikke's typical pregnant belly (arguably I'm pretty sure it's way smaller than usual, but bleh).
5/10, would've been so good if he just committed to normal rapid preg production with 1 baby or whatever, but if you're gonna show me more than 1 egg fertilized in a row you better make that belly big as hell. At least the pregnant sex is still good quality though.