Harry had never seen things like a normal person.
People he'd seen had, since he could remember, looked like corpses. Zombies.
Not the usual movie zombies- these weren't green or anything- they were dead people, with rotting chunks of flesh and bone...
The Dursleys were no different.
Dudley had huge flaps of skin falling off him, so you could see the rotting muscle underneath.
Vernon's face was gone, along with his eyes: they had been eaten by maggots long ago.
Petunia was simply bones with a few strips of rotting flesh hanging onto her ribs.
Harry saw the people who he knew rotting, being eaten by bugs and flies and maggots...
It was no wonder he was insane.
Luna had never seen things like a normal person.
She could see the future and the past and the present colliding and nothing she did, even closing her eyes, could stop the pictures.
The shrieks of dying animals, the stench of fear, the blood...
She could see and feel and smell and hear it happening, and there was nothing she could do to stop it.
She could see people's births, their deaths, their whole lives when she looked at them, every time she looked at them.
It was no wonder she was insane.
When Harry met Luna, he saw her as a normal person. Living, breathing, no maggots or rotting...
When Luna met Harry, she saw him, not his past or future, simply the present. So, really, it was destiny for them to be together.
They were physical opposites: Her blonde hair, his black hair, her blue eyes, his green ones, her pale skin, his tanned skin...
They saw the world differently to others, but when they looked at one another they saw what everyone else did, simply for a moment, and it was beautiful, like taking a breath of air when you're drowning...
Of course they began spending time with one another- their insanity made them simply fit. Of course they were teased and mocked, the Boy-Who-Lived with Loony Lovegood, but Luna was Loony, and Harry wasn't the Boy-Who-Lived, he was the boy who saw death.
And they moved to the country when they were older and they never stopped seeing what others didn't or zombies or being insane...they simply were.
Two people, in love, with the blue sky and the green grass and the simple facts of life and death.