I feel like the blackmail tag us kinda unnecessary... I mean the blackmail is really only in the first few chapters.
Literally said that they'd stop being friends if she didn't listen to her requests in this chapter. Coercion, manipulation, blackmail, whatever you wanna call it.
In case you're confused, this is Sakura Futaba from Persona 5 (left), the commissioner's Final Fantasy XIV OC, who is styled after Futaba (right), and the artist's Final Fantasy XIV OC (center).
Very vague but there's a scene where girl1 says that girl2 should be more aware of her face/looks (she has a cute/pretty face) and kisses girl2. I think girl1 is older. that's all i can remember, ty in advance!
Sounds like this scene from Love Letter for the Marching Puppy.