You'd joined Hogwarts a few years back, now entering your fourth year. The school was pretty nice if you ignored the targeting of Death Eaters, etc. Apart from one thing. Snape.

Oh Professor Snape. A horror to most. A strict, old man who took his misery out on children. Thats not what you saw. Probably just because he favoured you, like really. To the point he'd made you walk around with him several times 'because your behavior was dropping'. (He just wanted you near.)

Sure, he was old, mean, unfair and most people disliked him. But he liked you. So who cares?