One great place to find 'Robin loves Starfire fanfiction' is Archive of Our Own (AO3). There are numerous well - written stories there that explore their relationship in different ways, from cute and fluffy romantic encounters to more complex storylines that involve their growth as individuals within the Teen Titans universe.
There are some Tumblr blogs dedicated to Teen Titans fanfiction as well. By searching for 'Robin loves Starfire fanfiction' on Tumblr, you can come across some unique and creative stories that might not be as easily found on other platforms. These stories can range from short, sweet drabbles to long, multi - chapter epics.
You might also try FanFiction.net. It has a wide variety of 'Robin loves Starfire fanfiction'. Some of the popular ones often focus on their unspoken feelings for each other and how they gradually come to realize their love. It's really interesting to see different authors' interpretations of their relationship.