Poison Ivy II: Lily (1996) [Unrated Edition]

Poison Ivy II: Lily is a 1996 thriller film starring Alyssa Milano, and a direct-to-video sequel to the 1992 film Poison Ivy, starring Drew Barrymore. It was directed by Anne Goursaud and written by Chloe King. The original music score is composed by Joseph Williams. The film is marketed with the tagline 'Passion. Seduction. Betrayal. Lily wanted to be just like Ivy.'

Plot: Lily is a sheltered art student from Michigan attending college in California. She finds an apartment, and she soon notices her roommates, Tanya (a friendly artist who becomes a good friend to Lily), Bridgette (a cruel and taunting artist who initially takes an immediate dislike to her), and Robert (the silent but talented musician), all art students, aren't quite normal. For the first time out of her village, she is still used to her protected life in Michigan and frequently calls her parents. One day she discovers a box of items belonging to Ivy, a girl she has never met before. In the box, she finds nude pictures of the girl and her diary. She is soon drawn to the content, also desiring for the girl's sexual confidence and fearlessness. In class, she has trouble expressing herself, unlike Gredin, an attractive co-student and sculptor she soon starts dating. Meanwhile, she has found a job, babysitting Daphna, the daughter of her art teacher Donald Falk.
Slowly, one step at a time, Lily becomes obsessed with Ivy's letters and photos, attempting to take over her image. Soon enough, she cuts her hair, pierces her belly button and starts wearing more revealing clothes. Gredin grows even more attracted to her and it doesn't take long before they start having sex. He is unamused by the amount of private time she spends with Donald, though, but she explains it's because of the babysitting. She inspires Donald to perform art again, having noticed that he's long been afraid to express himself. She agrees to pose nude for him, and also finds her own way to express herself in the meantime as well. During this process, he secretly falls in love with her, which has a great deal of impact on his marriage to Angela. However through the movie, it can be shown that Donald's infatuation with her soon deepens to obsession.

–from wikipedia