M vs M

Main heroine Minori is the only child of an upstream family. She is bright and positive at school, but becomes a spoiled child at home. Her parents are abroad, and maid Chiyoko does all the house chores. Minori and Chiyoko treat each other as sisters and have concealed feelings towards each other.

One day Minori gets sexually assaulted by her female sempai from art club. Will Minori succumb to temptation or resist and cherish relations with Chiyoko instead?

[From vndbreview]