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Oikawa can feel eyes on him as he's removing his T-shirt. By now, he's gotten good at being able to tell, without looking himself, when someone is looking, and when someone is looking. Specifically, at a particular spot — or rather, two particular spots.
Oikawa smirks and makes a big show of stretching his arms high over his head as he sheds the shirt completely. They want to look? Then Oikawa's going to give them a good view.
He takes his time putting on his sunscreen — his favorite, a brand from a luxury cosmetics shop in San Juan — puffing out his chest as he lathers the lightly scented cream onto his torso and stomach. The stares have multiplied by now, and Oikawa is loving it, basking in the attention like he is in the early afternoon sunlight.
"Lemme help ya get yer back."
The voice is directly in Oikawa's ear, but it doesn't make him jump. Instead, it makes him purr as he nonchalantly squeezes another glob of sunscreen onto his hand and works on his left arm.
"I'm perfectly fine doing it myself, but thank you, Atsu-chan. What a rare offer of courtesy, for you."
"Ya know I'd do anything for you," Atsumu replies, not a hint of shyness in his voice, and he plucks the bottle right out of Oikawa's hands. Squeezing a sizeable amount of the cream onto his large hands, he takes his time lathering and smoothing it onto Oikawa's perfectly sloped shoulders and delicately arched back. Playful fingers tickle at Oikawa's ribs, even going so far as to slide across his ribcage to graze over the twin scars on his chest, as lightly and lovingly as a sigh.
"You're a brat, you know that?" Oikawa whispers, eyes closed. He swats at the straying fingers without any force.
"Yeah, I know. And that's why you love me. Right?"
Oikawa smirks as he feels chestnut eyes on him, aflame with desire. "Right," he says, taking hold of the hands caressing his chest and kissing them both, one after the other.