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James meeting Regulus' friends for the first time as his official boyfriend was definitely a big thing for everyone involved except Regulus. Sirius already knew Barty and Evan from when they would hang out at the Black household so he just decided to terrorise the living shit out of James telling him that they're "super protective" "super scary" and that "their approval means the world to Reggie". Remus just decided to go along and presented Pandora (who he knew from a study group) as the ultimate boss of mean girls. And when James almost shaking walked into the coffee shop they had arranged to meet up what he saw was Barty putting salt in Evans coffee, Evan drinking and spitting said coffee all over Pandora and her just throwing little rocks at him
The Slytherin skittles are Ghibil fans and one time they all watched "How's Moving Castle" together and Regulus fucking CRIED. Dorcas and Evan couldn't stop laughing, Pandora was just hugging him, Barty was absolutely shocked and Regulus was just cursing them all through his tears
Tough,strong and emotionless Regulus Black, who is TERRIFIED of insects and can not act calmly when he sees one. When the Slytherin Skittles first found ut about Regulu's massive fear, (1st year Barty showed excitedly his two best friends the cool spider he found and while Evan was intrigued,Regulus almost burst into tears) they could not get over it and it is still a huge inside joke they kind of threaten Regulus with "Oh yeah Reggie such a big scary man, oh is that a spider? "WHAT WHERE - OH FUCK YOU DORCAS"
Barty never liked kids. He was always that guy who was on the verge of slaping the baby crying at the airport and was just generally disgusted and kinda terrified by them. Evan on the other hand looved kids and they loved him too. There was something about him that they gravitated towards and he always gave them a performance - speaking with little voices,dancing and jumping around,hugging them, telling them stories. However, when Luna was born both of them absolutely fell in love with the little baby. They were at Pandora's house spending time with Luna CONSTANTLY ("She is MY daughter, you do know that right Evan?" "We're basically the same person Dora, so really she is my daughter too"). Barty let Luna braid his hair while she was drawing random stuff on Evan's hand. Barty got a tattoo inspired by the first drawing Luna made him (he's all sappy like that). And that didn't stop when Luna was a baby. During their individual visits the boys would talk about each other and their relationship problem and 12 year old Luna was genuinely always super helpful, which raised the question were they that emotionally immature or was she that emotionally maure? (Its a mix of both) . They all gossiped together and when Luna went to hogwarts Evan and Barty were kinda going through separation anxiety and sending her a letter like every week. They also had a party when Luna came out as a lesbian to them ("Oh thank fucking GOD, Barty" "Yeah Luna don't worry obviously we would love you no matter what but this just makes it much easier")
I always LOVE to imagine bartylus as that one toxic couple that would break up and get together an break up and get together again and you're their neighbour just listening to them fight all the time but also fuck every night