Well, there is one potential bad choice I can think of: if you choose to warn James in the shop then you are locked out Ema path and lose any future lewd scene with her so if you wish to add Ema to your harem don't warn James!1. There's no bad choices or consequences. So pick what you want to see the most. The game doesn't really punish you for anything.
1.) correct there really are no bad choices