Archive of Our Own (AO3) is also a great place. It has a very organized tagging system. Look for the tags related to Bloom and Sky and also the 'love' or 'romance' tags. There are often some really well - written and unique fanfictions about their relationship there.
You can try websites like FanFiction.net. It has a large collection of fanfictions, and you can easily search for Bloom and Sky love fanfiction using the search bar. Just type in their names, and you'll get a list of relevant stories.