Green
Luna's always been a hazy unfocused mass of pale skin and golden hair pierced by dark blue eyes to Ron so he's a bit startled when he discovers she's looking at him with such concentration. It's not at all what he expects from her.
Then again, he did not expect to be making love to her in his mother's garden by the pond.
It's a balmy summer night and she's naked and beautiful and straddling him, small palms resting on his stomach. She feels wonderful to him, a tight sheath, and her undulations are like the waves of the ocean.
Ron stares up at Luna, in awe, and just leaves his body to his instincts and the girl that's riding him under the moonlight.
*
Luna has always had a soft spot for 'ickle Ronniekins', as the twins call him. This soft spot has grown over the years but Luna's a smart girl and she never got between him and Hermione. But their relationship has run its course – to the blatantly obvious realisation that theirs is more of a sibling kind of love – and since Hermione has been sneaking glances at Fred all evening long, she figures this is her chance with Ron.
His body is deliciously hard under her and she gives herself over to the feelings coursing through her body from where he's deeply lodged into her.
She's not aware she's staring when he opens his eyes and there's surprise and… awe?
His hands tighten on her hips and pull her down harder, his body thrusts up more fiercely than before. She is not a bit ashamed of her moan at his actions.
"Gods," he whispers and Luna looks down at him again. He's a ripple of tight muscles, skin pale and freckly under the moon and framed by the freshly cut grass. Even the smell around them is green. Right now, Luna feels like she and Ron are part of Nature itself, an extension, a representation of life.