this is the crackiest ship ive ever thought of lol
but i love it sm
i headcanon that quarter hearts is the older brother of button mash, and fluttershy is quite endeared by him
in the levioverse, sweetie belle and button mash were pretty close as teens, but never dated. so rarity and quarter hearts had met several times before. after discord left fluttershy, rarity introduced her to a ton of stallions she knew. but for some reason, quarter hearts stuck out to her. she got a sheepish crush on him, and he got feelings for her soon after. they fell deeply in love, and got married after a couple of years. floret thought quarter hearts was pretty cool.
button mash is kind of intimidated by floret, but quite likes flidaisa
also quarter hearts got that nick in his ear when a cave collapsed on him. hes all good now, just has a cool nick now