It's really hard to read when the translation is not good. Especially with "my sister" expression! it's supposed to be your sister and it's said all the time by people talking to the sisters!!! And it's also confusing too.
I'm sorry but the editing and translation is off so it's quite uncomfortable to read, I'm not able to follow the story so unfortunately I won't be continuing this one, too bad, I think it could have been a good story