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The first time Jungkook did his habit was when he was coming home, no one seems awake since he took some over time practice to do a better moves in his dance. Well, he's a maknae, he always gets to shower last, so when he was coming home he didn't need to wait for the hyungs to finish shower.
Jungkook just finished shower and notice Jimin stirred in his sleep, seemingly having a bad dream, so he tried humming. It works. Startled, he tried to sing, not loud enough to make people outside their room to hear. Chanting quietly, he noticed Jimin stopped his moves and breathing softly, the frowns on his forehead is gone. Jungkook smiled, pleased, and continued to sing until Jimin looks relaxed in his deep slumber.
***
The second time was when all the members have nothing to do, only morning practices and they were done by the afternoon so everyone basically just lazing around in the house. Night time came, time to sleep already. Jungkook slept early that night, right after Yoongi actually, he thought he should use all this opportunity to sleep his day since tomorrow they will have more practices to come.
And at the past midnight, he heard someone snobbing quietly, his ears are really sensitive, then he turned his head to Jimin to see if he was the one who's crying, and indeed he was. He almost want to get up from his bed to wake him up but then the sudden idea strikes him. He tried to sing softly, and surprised how Jimin's sobs tuned down. He continued singing until Jimin relaxes entirely and deep on his sleep.
***
Then just like that, it continues on and on. Whenever Jimin seems like having a nightmare or whenever night starts, Jungkook's always sing him a song, sometimes it only goes for one song only, sometimes it goes to almost three songs, just to make sure Jimin is asleep. Jungkook also noticed he needs to sleep later than Jimin just so he can be sure Jimin enjoys his sleep. He still thinks it's a bit too much tho, since Jimin is his hyung, he should be the one who takes care of him, but he doesn't know, he just wants to keep this hyung taken care by all of himself.
***
It's like every other night when he was just finished practice last. After showering he goes to his room, and singing softly, barely audible outside of their room. He noticed Jimin is sleeping soundly, comes nearer and sits by the side of Jimin's bed. He strokes Jimin's hair, he knows it's really fluffy, but he never think it will be this soft against his hand. Then he touches his hyung left cheek. His hyung's skin is always so soft, like a baby, he remembers one of the cordi asked him what product he's using, and Jungkook, as his roommate, of course know he doesn't use anything, and sure Jimin just giggling it off.
Jimin's eyelashes are so long, it must be prettier if he opens those eyes, he really likes it when his hyung smiled at him in his crescent eye-smile. He continues the strokes to his left ear, his jaw, his chin, and ends up on his lips. Jimin's lips are really pretty, not really thick nor thin. It just fits perfectly on his face. And still a bit red, probably after the shower he took. And Jungkook just tempted to kiss it.
He barely brushes his lips onto Jimin, actually, but the sudden urge to kiss Jimin senselessly taking a toll on him. He deepens the kiss while closing his eyes, tongue ties Jimin's, feels all the sweets on him, he knows Jimin tastes sweet, he just never think it'd be this sweet. But then he snapped his eyes open when he feels the saltiness in his kiss. Tears trickled down from Jimin's eyes. He realized what he just did to his hyung, his favorite hyung to be exact. Scared his hyung might be knowing what he feels, he gets up and leaves the room.