If you ask Oikawa Tooru which is his favorite color in the world, he would always answers green while his lips forms a smile on his face and his voice without a hint of hesitation.
It doesn't matter that his wardrobe is full with a variety of blue, white, black and beige colors.

He doesn't care about the fact that he owns nothing that have the hue green amount his things. He only owns an old alien keychain that Iwa-chan give it to him when they were 7 and that has never left his side.
If you ask what tone of green does he likes the most, he'd smile.

A smile wide, sincere and with a limitless fondness in it will creep up on his lips, when he say that it'll depend of the mood but he doesn't elaborate further explanation. Maybe, one day, Oikawa will write about how much he loves the color green. How many things means to him.

Green mean beginnings, he thinks. Like the leafs that grown around they river close to his house every spring. In how Hajime's eyes had shinned when he smiled every time he let his back fall on the grass, laughing with Tooru about nothing and everything.

To Tooru, green is synonyms of adventures. It's being sitting in the long branches of the tree on Hajime's back garden, telling stories and sharing new hobbies together. Is hearing Hajime's voice reading his favorite book at him, with his eyes and voice full of enthusiasm.

If Tooru thinks on the green color, he thinks about being in complete calm. It means looking at Hajime's eyes when he is trying to calm him down in his worst moments. When he feels so little faith in himself but Hajime makes him believe like he can be invincible just with himself

Even if Oikawa think that's only possible if he has his Iwa-chan by his side. Hajime can make him believe in anything with that look on his eyes, lighty darken with determination. Tooru thinks about how in harmony he feels with the color green.

Is the last thing he sees before kissing Hajime, slowly, looking how those beautiful eyes close when their lips meet, full of longing and love.
When he thinks about the color green, he thinks in Hajime's eyes on his, his eyes with s different shade of green depending on his mood

Oikawa Tooru thinks in how much he loves seeing Iwaizumi Hajime's eyes. How they shine and look lighter with emotion when he's excited and they darken with desire when they are alone. Tooru thinks in how much he loves Hajime when he sees the color green and his heart best faster.

If you ask Oikawa Tooru why his favorite color is green, he will answered that it's because it reminds him to home. To the love of his life and the places when he had shared his worst and best moments, always with his Iwa-chan by his side.

Green is his favorite color because he can love anything more than Hajime's eyes.

I'm sleep deprived and this is just word vomit jajaja Ignore the typos, pls