These are all ongoing GLs with slow-burn (some are more medium-burn) romance:
Kono Koi wa Hoshi ni wa Negawanai (manga; college setting; childhood best friends to lovers; love triangle - a girl and a guy are in love with the same girl)
Yearning For A Night Full Of You (manga; high school setting; senpai-kouhai relationship; shoujo-manga vibes)
......
