Excellent yes

Question one, does the bracelet only apply to seasonal fire magic, or is it a general fire magic underwater thing?

Question two, if Saya asks for a second bracelet for someone else and offers to do the mermaids a favor in return, any favor they ask, would that be a possible thing? (she would also offer to help with something for their hospitality so that's two favors, she would offer these unprompted.)

Checking with Li on whether they investigate the darkness, will be back with that answer!