Alias: Big Sister (姉)
Relationship Status: Polyamorous Dating/Complicated
The older sister of a certain video game-obsessed high school boy with a mildly sadistic girlfriend, this girl spends much of her time in idle conversations with her female best friend about their sex lives and relationship issues with their respective boyfriends. However, this older sister eventually enters a relationship with not only her boyfriend but also her best friend as well.
Other than that she is less extreme compared to her best friend, nothing specific is known about the kind of fujoshi she is.