Since the sacrificial Olympics, the beautiful snake mentor Cui Beixi was promoted to the chief Great Diviner of the Northeast Province. Due to her status, that cheap husband also received the title of a viscount from the temple. Old Liu didn't even need to inquire; someone would have told him. The reason Cui Beixi hastily married a Medusa man is only known to Old Liu—really, the beautiful snake mentor married this obscure Viscount Kevin just to find a shield to cover up her secret pregnancy. Knowing Cui Beixi's character, it's naturally impossible for her to have a real marital relationship with this nominal husband.
As time passed, this Medusa viscount was also a man and couldn't resist sneaking around, having a few flings, which seemed reasonable.
This isn't unusual among the sacrificial aristocracy, but it appears this Viscount Kevin was a bit too numb, grabbing the opportunity right from under everyone's noses!