Satoru adored you, it was his well kept secret — or at least he tried, he just couldn't help but buy you new uniforms,  clothes, foods, perfumes etc.

He just loved getting a reaction out of your ever so dull expression, you were over 18 but technically one of his students.

You were young but mature, he didn't like that — Satoru believe everyone should have a childhood so he wanted to spoil you, give you the chance to feel giddy and joyful despite your ever so dark career.