Getting things out of his chest was not Shikamaru's forte. He had a big problem showing his feelings, he's working on it, but it's still too difficult for him.
After that talk with the Yamanaka family, he felt a bit inspired to do it. He quickly returned home. He greeted his parents and went directly to his room. He closed the door so that no soul would interrupt his creativity process. He thought of the letters between him and Temari and decided it, today he would write all of his feelings for her. His jealousy, his love, his desires, everything would be in that letter. He grabbed a pen and a paper, sat down and started with his duty.
"Temari,
I want to be honest with you. I've thought about this for a long time, and I've decided that I'm tired of hiding my feelings. You know I've always had a problem with it, but now I know, I'm jealous.
I'm jealous of the way you look at him. I'm jealous of the way you hold his hand. I'm jealous of how perfect he is and how insignificant and lame I am compared to him. I'm jealous because it should be me.
I know I'm your best friend, and I know this will change everything between us, but how can I be just a friend if I would give my life for you. I wish all those hugs, all that touching was more than just friendly. Every time you're in Konoha, makes me feel calm. But when you leave, it's like that feeling, that horrible feeling of being thirsty and not having any water around. I need you.
I love every single thing about you. I love your silhouette, the scent of your hair and the way you run your fingers through your bangs when you're nervous, your eyes, the beautiful sound your laugh makes and I even love when call me crybaby at any given chance.
When you're not with me, I can't stop thinking about you. I hope you can understand me. I'm sorry.
-Shikamaru"
He didn't gave it a second read, he just poured his heart out and hoped for the best. He searched for an envelope and sealed it and with it, he sealed his destiny. Nothing could stop him from sending this letter, except himself.
After sealing it, he looked at the envelope and imagined at least fifty different scenarios in his head. He started getting anxious and that was it. He decided to leave the letter in a drawer inside a folder from the Hokage's office he had laying around, that way no one could find it. If he ever send that letter, it would be when he was ready to deal with at least half out of those fifty imaginary scenarios.