Iwa’s victorious smile, the one he shares with Oikawa when they pull an amazing combo, the one he shares with his teammates when they take the games, is the most contagious thing. It’s all tooth and eyes half crescent with a brilliant light sparking within them. It’s an instant energy and adrenaline boost to any recipient of the smile.
Iwa gives small, hidden smile with the tip of tongue picking out when he eats something he likes.
When Iwa’s amused, his smiles is all laugh and teary eyes. It is bright and wide and shows a bit of his upper gum and his cute canine teeth.
Iwa gives this pouty smile when he coos and plays with his neighbor’s dog, Oikawa’s sister’s cat and all the animals he tries to get close to.
When Iwa’s shy or unsure, he has a habit of biting his lips. Oikawa can tell when Iwa’s smile is no longer shy or unsure but borderlines uncomfortable. It’s the strain in the corner of Iwa’s lips, how they twitch despite how hard Iwa tries to hide it out of politeness.
Iwa’s a nostalgic boy and smiles one of his softest smile when he’s lost in thoughts/memories.
Iwa nails his innocent smile at a very young age. Paired with Oikawa’s, they can get themselves out of nearly every trouble they get themselves into.
After Iwa has done or gotten away unsuspectedly from a successfully pulled prank, he’d wear this very pleased, very impish smile, a little crooked to the side, enough to make that one dimple he has on his left cheek visible.
While Oikawa might be the apple of many girls’ eyes, Iwa’s encouraging-and-inspiring-senpai smile has probably slayed more heart than Oikawa among the seijou volleyball club and the male student party.
Iwa’s smile is the most beautiful thing that ever blesses this world.