Hi, Bee! Lesley here, and this is Cecily Fortescue!
Hyacinth - They're from the same house so they know each other that way, despite the year difference. I don't think she's a fan of gossip, but she's still a girl, and what girl would turn down good gossip, yeah? She's friends with Alex so gathering and knowing info about people is not new to her. She shakes her head at them, but whatever floats their boat! They're both part of the Choir, so there's that as well!
Aidan - I think they can know each other because of Cece being a Healer? I think her small patients would include Quidditch players if they have minor injuries/illnesses and can't be bothered to go to the hospital wing. I am sure she think he's cute, and would be nervous around this boy, but she'll still be friendly! She'll probably get some answers from too. She would hate to, but if she has to, she will!
Emilia - They're both in Cooking with Charms, so they know each other that way. Cece would love her and be all friendly, and would probably go to her at one point, if she has issues to deal with. Also, EMMA STONE ♥
Hit me up on AIM (fake ending x) if you want to talk anything out further!