this is such a good question but im indecisive as hell... so ill give two options each
hs- would be ki, he loves that lil dude sm... just adores him (second- jay, his longest friend, couldnt live without him AT ALL.)
jy- hes choosing jungwon... when has he ever not chosen jungwon... but ideally he would turn all his members (second- heeseung, his only hyung, the one he adores)
jk- sunghoon!! thats his bffie!! they r opening an eternal cafe tgt!! (second- riki, his baby bro!!)
sh- jake... his number one ALWAYS... i dont even fw jakehoon like that but they r insane abt eo. (second- sunoo <3 he adores noo sm and shows that by his eternal teasings!!)
sunoo- jungwon, his dongsaeng thats like an older hyung, i think noo takes care of won secretly bcus won has to take care of all of them <3 (second-hoon, he annoys him sm but hes so used to it that he'd miss it too much when its gone)
jw- JAY obviously... idek why i gotta tell u why here... thats his bffie... his fav hyung... his no1 Guy!! (second- sunoo... thats his other half, even though noos older he feels like they r same aged friends <3)
nk- heeseung!!! he looks up to him sm and would do annnnything tgt with his hyung <3 (second- jake, same thing as hee only jake is the victim of kis eternal teasing)

turns out they all got chosen twice!!!