After defeating Radagon (or Marika) and the Elden Beast, you wake up in the same spot where you were fighting Radagon, and you see his dead fractured body on his knees, and headless

You we're about to go to his body, but then you stopped your tracked, and decided to kneel down with one knee and lower your head down, and then summoned Ranni

She slowly rises up from the ground, and she slowly turned her head to her right side before she speaks

"... The battle is over I see..." She says it as she slowly turned her head to where the fractured body is at, she slowly walks up to and then picks up the head, lifting it up with all of her 4 hands.

"I do solemnly swear... To every living being, and every living soul... Now cometh the age of stars.... A thousand year voyage under the wisdom of the Moon..." She says it while water, the moon and the stars appeared

"Here beginneth the chill night that encompasses all, reaching the great beyond.. Into fear, doubt, and loneliness... As the past stretched into darkness..."

You then lifted your head up again to look at her, seeing the fractured body fading, and the head disappearing from her hands. She then slowly turns around to where you are, and looks down at you, she looks at with a small slight smile in the corner of her lips

"Well then... Shall we?.. My fair consort, Eternal" She says it as she slowly extended both of her right arms and hands, and where she has a ring on it, waiting for you to take her hand.

Congrats you're married! :D