Here's the brief IMDb plot summary for the French film Don't Deliver Us from Evil (1971) [French: Mais ne nous délivrez pas du mal):
During summer break, [Anne and Lore] two bored Catholic schoolgirls vow to become Satanists and play a series of increasingly dangerous and morbid games.
The nymphets "morbid games" include
Nassim Taleb summed it up well when he wrote in Antifragile, “Just like in matters of seduction, people lend the most to those who need them least."