you know what would hurt ??
have Alice be actually friends with Barty, have Barty look up to the Gryffindor girl because she scared away the mean kids in his first year when they made fun of him for being the minister's son
have first year Barty trail after Alice like a lost duckling in the first few months, too scared of making his own friends after being sheltered all his life
have Alice be the one to introduce him to Dorcas, the smart brave girl she saw standing up to bullies
have Barty hating the Gryffindor house, but never his Alice
have Barty look up to Alice and take example of her, still causing mayhem with the Rosier Twins but nonetheless doing his schoolwork
have Alice scolding Barty when he does something stupid just like an older sister would
have Alice be disappointed in him when he starts hanging out with the Death Eater's children and start using slurs
have Barty feeling insane amount of guilt, but even his adoration for Alice can't override his need and the euphoria that disapproving and embarrassing his father brings to him
have Alice have her heart getting broken when she finds out her younger brother got involved with the Death Eaters
have Barty being divided between his love for Evan (and Regulus) and his love for Alice, but ultimately he loves his husband boyfriend more
have Barty finding out what Bellatrix did to Alice and her husband and their poor little kid
have Barty apparating to her house immediately after finding out
have him found his sister lying unconscious and unresponsive with her little baby crying in the back
have Barty kneeling down and cradling her body, tears streaming down his face while Bellatrix laughs and mocks him for being so soft even after all this time
have Barty caged and imprisoned for the cause of Alice's state despite not touching her