https://www.dlsite.com/books/work/=/product_id/BJ106218.html
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Conquest Training Cafe - The back menu is sister education.

"I fell...completely."
The back menu of a fashionable cafe. Sayuri shows up at her sister's part-time job.
However, the manager there has trained all the staff to be obedient and erotic maids...
Both sisters are under the manager's control, and the manager's younger brother, who is in love with Sayuri, awakens to the sight of his brother's training, and his secret side awakens...!
The sisters are tortured in every hole, and conquered by giving them all the pleasure they want.
Brothers and sisters are trained side by side at the same time!
They continue to torture each other as they care for each other, and discipline them to serve each other...!

Thanks for the upload and synopsis :)

Base +19, Fofotron +8, darkwing42 +50, yupokamusi -8