Here's a storyline (or maybe more of a character outline that could lead to a storyline?):
Rhoda and Florence are servants in the Straud household. They must live and work together, but they hate each other and are always trying to sabotage the other one.
https://66.media.tumblr.com/9a3c67969811c78f3ad1cfa4859ecbd3/6e0899d756096408-1e/s1280x1920/252d4c4912b1023fa2af9f82c12e17e6ee07640c.png
Back in the day, Rhoda had a brief affair with Mr. Straud. This is one of the reasons Florence hates her -- Florence had a crush on Mr. Straud but he never even noticed she existed.
https://66.media.tumblr.com/b48babe4cd1e570d0b899f6491058f46/635fc6e7c97f34f3-70/s1280x1920/a41018d12e5e950733d624fbdcbea552f2c386c5.png
Mrs. Straud knows about the affair, but she pretends like she doesn't. She never fired Rhoda because she wanted to keep her around in order to make sure Rhoda had a miserable life. She sees the fighting between the servants and likes it because of that. It also puts her in a position of power--both of the servants are always trying to please and suck up to Mrs. Straud in order to try and be the one she likes better.
https://66.media.tumblr.com/4a81e2056b2e75a64bd5592de243a773/635fc6e7c97f34f3-07/s1280x1920/e033a01a238e8a0d0e30b7e5d63960bba0483f8d.png
Also in the family: Vlad, a human teenager. He's following in his father's footsteps to run the pharmacy/general store/post office (it's a small town), relegating his love for music to a hobby so that he can be practical about his career. He's never all that happy, probably because of not following his love of music. He's also very socially awkward, especially with women.
https://66.media.tumblr.com/b1b736114301ba941e0ef31443fddd9b/635fc6e7c97f34f3-a5/s1280x1920/b7b08842bb4e95a71c0a8c2ecb2dcdccc7b3e2a6.png
Elisaveta, the youngest. Growing up in this atmosphere has taught her to be manipulative. She puts on the face of the sweet, perfect girl, but she knows how to be conniving and get her way. Her capacity for empathy is not all that great.
https://66.media.tumblr.com/4c8e2e68a08c6ab0cb7d1aac2e636cef/635fc6e7c97f34f3-a1/s1280x1920/2aa12ac86dd5ba9f1c316c7a1436cecb461c57c1.png
