Ema's Sister (Brothers Conflict Fanfiction) ( Masaomi X Oc/Reader)

Please know that none of the characters' ages are the same as the anime. Since I don't wish to spoil it for others, it will only be a bit similar but, not entirely. The same goes with all of my other Anime fanfics.

Esmera Hinata is the Older Sister of Ema. She is only nineteen, like Ema, she gains thirteen brothers but they are a lot different. She is well aware about Ema being adopted though she never mentioned it to her since she didn't want Ema to be self conscious of doubt herself. She is aware that she wasn't Rintarou's biological Daughter and wasn't formally adopted by him but she still uses Hinata as her last name so Ema doesn't ask about it. She excels in absolutely everything. She had always taken care of Ema and even works part time as a Patisserie. She is very well known and is also a Novelist. She goes by Mera Hina as a Novelist. Aremes Hitana is her Patisserie name that she goes by. She is extremely famous for her abilities and even received her Degrees in certain things such as Arts, Patisserie, Filming, Singing and also in Psychology. She has kept it on the down low and only her Father and Miwa know about it.

What will await her?
Can she handle her thirteen brothers?
Will they get along?
Will they discover her secret?
What will she do?
Can she trust them?