looking for a story like Metamorphosis, but they actually continue to love him

I read Metamorphosis and I LOVED IT, it’s a brilliant story. But I also watched Lars and the Real Girl recently, and added How to Hold a Cockroach to my TBR, and I suddenly had the urge to read a book that is as tenderly loving as the movie, and as the title of the second book implies. Like a “Would you still love me if I was a worm?” scenario but it comes true, and the answer is yes. I’m guessing what I’m looking for is quite niche, but if anyone has something in mind, please let me know!