Clarice seems to have a whole bunch of demihuman love slaves. It seems unlikely she would be the kind of character who would fall for the MC. It would be a bit much for the MC to have a wife who has multiple other lovers. Even though this series is supposedly about how tough it is for a (mob) guy in an otome fantasy world, but realistically the readers should still like and approve of what they are reading. I doubt this series is written with NTR fetishists in mind. Let's not forget Angie, despite being a duke's daughter and thus extremely well off, doesn't have any such companions, with the excuse provided conveniently by the plot. Livia would be too poor for it, I guess, so no excuses were needed. Although Livia is so virtuous and innocent that I guess she might not have any even if she had the dough.