After seeing his friend lean into one of the lingering touches, he started watching her as well. He didn't know why he had never noticed it before, but he realized that every move that the Professor made was followed by two dark mocha eyes. He always knew that his friend admired their Head of House, but the thought that she may like her the way the Professor seemed to like her, never entered his mind. For a second, he considered telling his friend what he saw, but decided against it in the end.
He would sit back and see how things would play out, only stepping in when he would need to.
One day, after fighting with Ron, Hermione was quieter the usual during class. He knew that Ron was in love with Hermione, but he couldn't tell him that Hermione wasn't in love with him without revealing what he knew. He hoped for Hermione's sake, that McGonagall would pick up on his friends distress.
She did.
He watched as she moved toward their row and stopped in front of Hermione's end. At first Hermione didn't look up from her blank parchment, but when McGonagall cleared her throat lightly, her head snapped up. Harry wasn't surprised to see a new spark enter her dark chocolate eyes.