mmm i think it was always more of a case of jongin liking sehun a bit more as a friend. they were close because they've been together in the same school and were trainees together but jongin probably tried a bit harder.

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and then sehun's tastes starting changing, started getting a bit bolder and more daring and jongin still lives in his oversized shirts and ratty jeans. naturally, sehun sought out zitao, who shares his same taste in the flashy and gaudy and maybe jongin sometimes wonder why they don't talk anymore.

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i think they're the kind of friends now that don't need to talk every day but are still tight because of shared history. except jongin still doesn't understand why sehun needs to buy that expensive car and sehun doesn't get why jongin carries around /paper bags/