sylvie herself is a very sensitive and gloomy girl so itd be very easy for eiki to tear her down but it would be exceedingly difficult for him to build her back up again and it would turn into a situation where she lets herself be annoyingly clingy and constantly asks for reassurance and is a little bit unhealthily attached to him instead of being the more confident and friendly girl she had once been when he encouraged her at the beginning. however if miki were the one to build her back up i think shed return to being more confident and while shed return to avoiding eiki shed also grow horribly jealous if she saw anyone else with him