ONE.
luna sacrificed her relationship with her pack to help klaus

TWO.
she didn't get made at klaus for the crescent curse being enabled again

THREE.
klaus always visited her on the full moon, the only time she was human

FOUR.
he had freya undo the crescent curse for luna's sake

FIVE.
she confessed her love for klaus over the phone even though he 'loved' aurora

SIX.
gave her a moon necklace representing their love

SEVEN.
klaus saved her from aurora's turned vampires

EIGHT.
klaus offered her to stay with him until she was safe

NINE.
she got him the same crescent moon necklace to klaus

TEN.
klaus confessed his love and kissed her, and got back together on Christmas and had sexual intercourse

ELEVEN.
luna took a bullet for him

TWELVE.
luna is carrying a mikaelson in her belly

THIRTEEN.
called her family rather than kol

FOURTEEN.
gave her the title of Queen of New Orleans

FIFTEEN.
she saved klaus from aurora

SIXTEEN.
klaus made luna suffer less from her fatal bite from lucien

SEVENTEEN.
sacrificed his unborn child to let luna live

EIGHTEEN.
luna didn't let klaus say his goodbye because she knew that they would find their way back to each other

NINETEEN.
luna is pregnant with klaus's child again

TWENTY.
she and hayley are determined to find the cure with Luna ready to fight her way to klaus