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Tatsuya's only order from the Yotsuba is to protect Miyuki with his life and maintain her lifestyle and the secrecy of their background. This is also Tatsuya's wish so there's no reason for him not to follow the Yotsuba's order and they barely have any other contact unless something important or threatening turns up.
The only thng she dislikes is the way her aunt, father and the Yotsuba butler treat her brother, but I see no reason yet for him to leave them. Since he has several job's where he's handsomely paid and well respected, gets to do what he wants despite requests from his familiy, and gets protection from one of the strongest magic clans in the country.
His motive for going to the 1st High besides being with Miyuki, is stated as to gain access to the affiliated Magic University's Records for his own personal research.
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