Jules's Links
Jules and Fia have been friends since they were children, with their leader and second-hand man dynamic being a solid staple of their relationship for years. Jules actually has feelings for Fia, but out of respect for her and their friendship and profession, does nothing about it himself.
Fia trusts Jules with her life. How could she not; he's always been right there by her side through thick and thin. There's no one else she could imagine trusting to be her second in command of her little business. She is fully aware of Jules's real feelings for her, despite his attempts to hide it. It's unclear what she feels about it beyond thinking it's endearing, though.
Originally, when Jules first made his way to Adam's club, he was simply looking for a way to get his mind off of Fia for a night. He wasn't expected to bond with the club owner over their mutual love of felines. It didn't take long for a friendship to form, and Jules always greatly looks forward to hearing about Adam's cats, while also chatting about his own.
When Jules came into Adam's club, instead of spending time with a hostess, he instead ended up befriending the owner. Adam passed by as he heard the man mention something about a cat, and the two were fast friends. Now they meet regularly to share stories about each others cats.
Jules has been friends with Mia for as long as he's been friends with Fia. He's protective of her as well, but more in the sense that he tries to keep Fia's criminal activities under wraps from her. He thinks of her as like a sister, and though it often embarrasses him, he appreciates her attempts to get him and Fia together.
Mia and Fia were both childhood friends with Jules, and even now Mia and Jules are remarkably close friends, and she sees Jules like a brother. Mia is fully aware of Jules's feelings for her sister, and is probably the biggest supporter of them getting together. She tries her hardest to drop hints to Fia or try to set them up together, to no avail so far. But love finds a way, right?