since fred and george interacted with the marauders map i feel like they would kind of know the personality of moony, padfoot, wormtail, and prongs just because they had to do some poking and prodding to get into the map. so during order of the phoenix while they were around sirius and remus what if they started to overhear them joking around like two of the marauders and they start making connections. then one day, they hear sirius call remus ‘moony’ and loose it. they would run into the room and ask if the two were actually the ones who the twins idolized for all those years, and they start a conversation about all of the memories both duos had with the map.
Panromantic ace Lee Jordan being advised by Fred and George on the Hogwarts express in Harry's first year after the bombshell of Charlie announcing he was aroace at the end of summer just before going to Romania - R