First Kill is a Netflix original series which debuted in 2022. The story revolves around two teenage girls. One a vampire named Julliette and one a monster slayer named Calliope. Both are going through a kind of puberty for their kind in which getting their first kill will launch them into adulthood.
By chance they end up targeting each other for that but botched it during a round of spin the bottle.
In the throws of passion Julliette bites Calliope leaving herself open for Calliope to stake her but neither get the kill as Calliope runs away before confirming the kill.Thow everyone in her family are vampires with the family being described as a matriarch (vampire leadership being passed from mother to daughter)
there is only one in the family that falls into vampire in the traditional sense (meaning she openly stalks and feeds during the series) and that's Juliettes older sister Elinor.
Though at the end of the day her motivations are all selfish as she's only truly thinking about how her sister being shunned would affect her standing in the family.