Kit's an emotionally stunted womanchild who spends most of her waking hours studying medicine and slamming coffee, who also has a rare magical condition that makes everything that isn't the underclass look like a cloud of molecules. Poppy just happens to be the second member of the underclass Kit has dealt with personally, and the first one that isn't 100% devoted to a still-living wife and kids. Her hormones and her desire for companionship got the better of her, and now she has Murderthighs McSavemychild wrapped around her finger.
Kit unfortunately doesn't have a fetish for molecule clouds, so she wants to stick with opossum ass. She's also written by Morbi, whose closest thing to a self-insert is Kit, has a hard mom waifu kink, and who has a unique-at-best perspective on love and commitment.