He fills her up, spraying the inside of her womb with the nectar that expels from his wood. Her stomach inflates and she is filled up until the point where nectar is dripping from her mouth and backside.
Then Madara removes his wood from her. He pushes down on her belly and a thick stream of nectar spews out from her gap, until she's covered in it.
Then Madara says; Got... wood? HAHAHAHAHA! *hands on hips, in manly pose*