Jimmy totally flirts with [i]everyone[/i] but I don't see any reason why he can't have a liking for Tessa. Quiddich rivals + Jimmy'll be laying down the charm, if that sounds okay?

Hnnnng. She'll be like, 12 years older so maybe Jimmy's aunt? Son of Siobhan's oldest brother or something. I totally messed up the siblings, unless--

Hmm... She could be his older sister by 12 years, I suppose, which would make him born next year in this universe. A surprise child. Parents just gotta be super fertile x)