Here's an idea:

A story set in modern Russia, a convicted rapist broke out of jail and decided to seek vengeance upon those that imprisoned him in the first place.

The constable's daughter Mila was his first victim, a timid girl in her final year of high school with a promising career in rhythmic gymnastics. She was kidnapped and taken to an abandoned factory after one of her practice sessions, there she was mercilessly raped and sodomized, followed by a slow and excruciating death by getting impaled on a rusty concrete reinforcing bar through her violated anus.

I imagine the rapist might do something special with Mila's flexibility, it would be such a shame not to take full advantage of such a promising gymnast. Be creative!