Infinite:

something always happens whenever we're together - lirazel - myungyeol

they cannot scare me with their empty places between stars - lirazel - myungyeoljong

what skin does - lirazel - wooyeol

creep on in - lirazel - myungyeol, but focus on myungsoo suzy friendship

introduction to contortion - lirazel - myungyeol 

sealed with a kiss - yeolmonster - myungyeol

my roommate is a kingka! - ninaaalwj - myungyeol (guilty pleasure of mine, it has cute!soo in it)

starving - eseech - myungyeol/ot7

timeless; madness - eseech - lhyun

infinite salvation - katingatrouble - myungyeol, hojong, woogyu, dongwoo/moc

can you smile - youngsoon - myungyeol

it was innocent - koyaka - myungya

like or like like? - theblobmaster - myungya

source of comfort - hoyabear - myungya

uneventful realization - theblobmaster - myungya

in your dreams - yeolna - myungyeol (myungsoo is sailor moon and sungyeol is tuxedo mask, seriously it's my childhood mixed with kpop, it's awesome.)

anything could happen - laeryn - myungya

snapshots - eoryndal - myungya

love is somewhere in there - euants - myungjong (sungjong tops in this one.)

untitled 010 - gyu-jong - dongsoo

troublemaker - onyu - lhyun

fairgrounds - saracupcaked - lhyun

yes, i know it's very slash/ heavy, but they are easier to find than het pairings.  but out of all them, i suggest anything by lirazel, untitled 010, in your dreams, sealed with a kiss, infinite salvation, and it was innocent first.  the others are good, but i've read the ones listed above multiple times, lirazel's my go to author when it comes to infinite fics, while the other authors are great too, there's just something about lirazel's works that make me want to read more.  i'll have some more fic recs up soon, but these should get you started, because next fic recs won't just be kpop fic recs, but a few star trek and harry potter stories that are well written and fun to read.