Majuu Jouka Shoujo Utea

Karen AKA Utea Charm and Mizuki AKA Utea Grace signed a contract with a mysterious creature, Kurio, to fight against beasts as magical warriors. One day, the girls transform into Utea to purify a magical beast that appears in the school, but Mizuki gets captured by the beast's tentacles. The furious Karen tries to crush the beast with a special move, but she gets transported to another dimension. In this dimension, Mizuki is found being humiliated and molested by the tentacles of the beast, which Karen thought she had already defeated. Despite her shock, Karen, after hearing Kurio's advice, takes on the monster's tentacles to save Mizuki...

(Source: Coolmic)