Im looking for a good Yuri or Shoujou Ai series where the main relationship is really defined, like you know the two characters are together. I dont want anything too sexy or anything super actiony. I would also like it if the plot focused on their relationship and not some magical quest or something 🙂

Love My Life
Maka-Maka (although it concentrates on 'communication', it's mainly sex)
Love Vibes
Sketch <-- oneshot, not entirely what you're looking for, but worth reading.
Wedding Bells is quite... unique. Oneshot.

And I can't recommend works of Morinaga Milk enough.

Current avatar features Badou from Dogs.

Strawberry Panic! and Revolutionary Girl Utena: The Adolescence of Utena...Haru yo Koi is one but it's shounen so it doesn't revolve so much around the yuri relationship. Free Soul is good too or you can find some here >> http://www.mangaupdates.com/series.html?genre=Yuri&filter=scanlated&perpage=50