Power and control can also be motives. The older woman may enjoy the feeling of having influence over the young girl. She can shape the girl's views, tastes, and experiences, like in a relationship where she decides what they do and how the girl should behave, which gives her a sense of power.
Well, perhaps the 'best friend' is jealous of the woman's relationship and tries to steal her partner. Maybe she uses her charm and knowledge of the woman to manipulate the situation.
Well, perhaps the 'best friend' has some hidden motives. It could be that she has always been secretly in love with the woman but never showed it. Then, due to some event or change in circumstances, she decides to try and seduce the woman. For example, if the woman is going through a tough time in her relationship and the best friend sees an opportunity to be more than just a friend, she might start using her closeness to the woman in a more seductive way.
There's also a possibility that the two of them work through it. The woman might tell the best friend that she values their friendship but not in this new, seductive way. They could then try to re - establish their friendship on a more normal and healthy footing. However, it would be a long and difficult process filled with lots of emotions like guilt, anger, and confusion for both of them.
In 'The Price of Salt' by Patricia Highsmith, there is a complex relationship that could be seen in a way. Carol, an older woman, has an intense connection with Therese, a younger girl. Their relationship develops in a rather unconventional way within the context of the 1950s society. It shows how they are drawn to each other and how Carol's more worldly and confident nature has an allure for Therese, who is just starting to figure out her own identity.
I recommend "The Evolution of the Vampire Queen" and "The Vampire King: Please Don't Come Near" to you. The former told the story of the female protagonist's growth as a vampire queen, leading the vampires to defeat the enemy and dominate the world, as well as her own love story. The latter told the story of the female protagonist being an immortal cultivator who transmigrated to a world with vampires because her blood was destined to be different from all other vampires. Her blood was regarded as divine blood by the vampires. These two novels have powerful female protagonists and plots full of passion and battle. I hope you will like them. I hope you like this fairy's recommendation. Muah ~😗
It could end up in a messy situation. Maybe the woman realizes the guy's not worth it and goes back to her boyfriend, or she could get stuck in a bad relationship with the new guy.
For example, Vampire Rider and War of the Brothers, which had one female and many male or male vampire animes, one could refer to the following:
The Cross and the Vampire
Vampire Hunter D
Vampire Hunter D Season 2
4. Blood of the Holy Demon
Vampire Hunter D's Male Lead's Past
6. The Past of the Female Lead of Vampire Hunter D
All of the animes mentioned above had complicated relationships between vampires and humans, as well as the setting of one woman and many men or the male lead.
The movie you mentioned might be Twilight, an adaptation of a novel by Stefanie Meyer.
In the movie, there was a fierce battle between werewolves and vampires, and an old vampire was summoned. The protagonist was a male and female protagonist. They were the hybrid between the werewolf and the vampire, and also the link between the werewolf and the vampire.
The movie was very popular and received many good reviews. If you have more information, I will try my best to provide you with more detailed answers.