Headcanon: Tenzin loved Lin's hair down.
Personal headcanon
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Lin was halfway done pinning her hair up. She and Tenzin were heading out to some dreadful political gala for the night. Both had obliged to going even though they saw the whole thing as just another ploy for fat, obnoxious men to make more money and bask in each other's 'greatness'. She had decided on an ankle length black form-fitting dress with her emerald necklace around her neck. She had decided to pin up a good amount of her hair to draw attention to her favorite gift from so long ago. She was almost done when Tenzin walked in to their bedroom.
"You're putting your hair up?" Tenzin asked her with a frown.
"Yes, it seems to fit with the dress and my necklace." Lin said turning around to look at him.
He came to stand in front of her, still showing that disapproving look on his face. He reached through her hair to take out one of the pins holding it in place. Sighing, he took her shoulders and spun her around gently until she faced the mirror once more.
"But you look so perfect with your hair down." Tenzin said as he took out more pins and kissed her neck leaving a trail of kisses up to her ear.
He heard Lin sigh in content and took it as a silent affirmation to keep unpinning.
"It just amazingly frames your beautiful face and the emerald will look like a hidden treasure, having to throw your hair over your shoulder to show it off...or not." Tenzin whispered in her ear as he unpinned the last of her hair.
"Mysterious, I think I like it." Lin replied with a smirk on her face. Tenzin buried his hands in her ebony curls brushing it out for her, making it fall over her shoulders and along her spine.
"This is when you look the sexiest, hands down." Tenzin told her with a smile as he saw a flush creep into her cheeks and her emerald eyes shine.
"Well then I guess I'm going to have to keep it like this then." Lin said playfully as she rose from her spot and gave Tenzin a quick kiss on the lips before going to gather her things from in front of the doorway.
"Shall we get this horrid evening over with?" she asked with wink, motioning for him to come.
"We shall." He answered, offering her his arm and leading her out the door. Looking down at her he couldn't stop thinking that as long as she kept her hair down, he wouldn't mind going anywhere with her. Not anywhere at all.