Hikaru is already super honest and has no filter, and he acts on his emotions. So he probably won't be affected, because it wouldn't make much of a difference, HAHA! But if anyone wants him for any reason, let me know!
As for Sougo, OOOHHH BOYYY!! What people don't know about Sougo is that he is secretly the king of keeping thoughts and feelings to himself. He may come off as blunt, but really he lives with keeping his guard WAY up at all times. He has mega trust issues and doesn't think anyone would care anyway. So with this event, he will probably... be... more honest with his feelings? And it will probably be super surprising to anyone... or everyone. He's going to be a mess. He'll probably openly want affection. Part of me is debating whether or not he'll express himself so much so that he ends up in tears at some point, because he'll most likely be talking about his sister a lot, which he never does because FEELINGS, but WE'LL SEE.