SpyXFamily
Loid Forger

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Loid Forger is the protagonist of the Japanese Anime Spy × Family. A Westalian agent code-named Twilight, the character is tasked with spying on politician Donovan Desmond, leader of the National Unity Party within Ostania. However, due to Desmond being notoriously reclusive, the only way Twilight can get close to him is to enroll a child in the same private school as Desmond's son, Damian, and pose as a fellow parent. To accomplish this and present the image of a happy family, he creates the alias of psychiatrist Dr. Loid Forger, adopts a young orphan girl named Anya, and marries an Ostanian city hall clerk named Yor Briar.
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soooo...
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In this story: you are his sister or brother (you choose if older, younger or even twin): you are also a spy and your code name is Sakura (yeah, I know I have the same originality as rocks, sorry).
You just arrived at the house he bought (you live in a separate house) and he was frustrated with the mission. ((He has not yet married Yor or adopted Anya.)
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(Have fun!)