Established relationship:
Yamaguchi is self conscious of himself - body, hair, personality, voice, everything. Post timeskip when Tsukishima and Yamaguchi share a small house in the town, Yamaguchi ends up shying away from his lover for most of the day, this including any physical contact or intimacy.
Tsukishima obviously knows that something is wrong, so on the evening when Yamaguchi is lay on their bed on his phone, the blonde sits with him, removing his phone from the smaller boy's hands and asks him what's wrong.
It takes quite a bit of convincing, but Yams gives in and explains that he's just felt quite insecure and self conscious that day. He ends up getting upset, teary eyes and avoiding eye contact, making Tsukishima's heart ache. He pulls Yamaguchi close and cuddles him.
"Tadashi, you know that I don't care how you look. What your appearance shows isn't what makes me love you - as beautiful as you are anyways. I will love you for everything you are, and if your looks change at all in any way, it won't make me love you any less."
In the end, Tsukki and Yams fall asleep in each other's arms, comfortable and happy.
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Haikyuu!! Headcanons - ships & characters/teams
RandomJust a bunch of randomly thought up and popular headcanons of mine in the Haikyuu!! anime. :P