I do too! I feel like they'd have a really fun and playful dynamic since they both seem to be mischievous and a little cheeky. There's also the 'godbrother' aspect, which creates interesting conflict for them. Is it wrong, should they or shouldn't they, can they resist it, how can they tell their family? Same for their age difference! That's a lot of responsibility for Teddy to deal with. Worrying if James knows what he's getting into, if he's mature enough, if Teddy's taking advantage, if Harry will be disappointed, if his parents would be disappointed, if they're making a mistake, etc, etc. Maybe James has grown up idolizing and adoring Teddy, but it's harder for Teddy to accept the change in his feelings. One thing i'm sure of though, there'd be a lot of love between them, they can work things out. :)