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As a rule Han hated other beings touching him. It was way too often used as a way to get close only to hurt him. Even those he trusted most often fell victim to his need for distance from others. Which made his romantic relationships short lived most of the time. Well all but one time really.
Because for some reason Chewie was fine with it. he didn't mind when Han was having a day where he would shove away any attempts at physical contact. He just gave Han the space he needed. Like that day where the first thing Han had done upon waking was crawl off their bed in his hurry to remove the contact. Chewie had woken up from the jostleing, but all he had done was give Han a sad look. Which never bothered Han for some reason.
But as the day had gone on the crawling feeling of Han's skin had subsided to some degree and he went from wanting no contact to craving it. But still wanting nothing to do with real contact.
Which was how he found himself sitting on one of the short stools they kept around next to Chewie, who was at their table, just far enough away to not be leaning on Chewie's leg. With Chewie's large hand moving over the top of his head. Neither of them speaking but doing their own things as Chewie pet the top of Han's head.
It was something that they had started early on in their physical relationship at Chewie's suggestion. He had noticed that Han had been calmer when he had played with the human's hair. And Han was willing to try it. Anything to help mitigate the way he felt and what it would do to their relationship. And it worked.