For you to understand what happened before the kage summon, we will get back in time a few days after Naruto defeated Pain.
Naruto was in her room. Or the room that was given to her. Her former apartament was destroyed. By her side stood Konohamaru. He was looking at Naruto who was looking at her window.
"Naruto-nee-chan..."
"What, Konohamaru?" Asked absent-minded Naruto.
"Why are you so sad?"
Before, when Sasuke was still in the village, she and the boy were very close. They were like mother and son. Almost. If you forget the age. Most don't know, but in some nights, when Konohamaru couldn't sleep or worse, had a nightmare, he searched for his nee-chan. He sneaked out of his home, and hurried to Naruto's house.
When he arrived, Naruto would wait for him, with a cup of cocoa streaming hot. Then they talked. About everything and nothing. When Konohamaru would feel sleepy, Naruto would get him to her bed and began to sing him a lullaby. When asked how she knows that song, she answered that a big fox was singing this song when she was little and sad. He was still little and didn't understand, but now he knew. It was Kyuubi. That made him feel a little bad about asking about that fox. But he also remembered that in some nights, when he was almost asleep, he heards a beat in Naruto's window. Naruto, still awake and singing, went to invite the stranger inside, Konohamaru didn't know him, but would later meet him. He had almost shouted the fact that Uchiha Sasuke was visiting his Naruto-nee-chan late at night. He remembered the whisperers between her and he.
"Why aren't you sleeping? We have school, you know?"
"I could say the same to you too. I wanted to see you and i find you singing to a brat?"
"Konohamaru isn't a brat! He is the same as you. A lonely child who founds comfort in a person whom shows love towards him."
"And you love him?"
"Of course. He is like my little brother. Or more like son. You don't know how adorable he is."
Then Naruto would invite him to stay the night. She could take a futon out and the two would sleep together. But the boy would refuse, say that he just wanted to see her and after he stole a kiss from her, he leaved in a breath.
The next morning, Naruto would lead him home and in the meantime, she would told him not to tell that someone else was in her room. Not even to jiji. He agreed when he saw the sad look.
The same look she was wearing now.
"I am not sad. I am waiting."
"What for?"
"You can't sleep, can you? Why don't i sing you a little? Come here." She evitated the question. Again. She motioned him to come closer to her, then hugged him.
"Naruto-nee...chan?"
She began humming the oh, so familiar lullaby. She positioned Konohamaru's head to her lap.
His eyes began to drop. 'That's bad...' thought Konohamaru trying to remain awake. Last night he couldn't sleep because of the nightmares. And Naruto's voice was so alluring...
"Konohamaru. I for now will dissapear for some time. Sasuke needs me. I hope you will tell the others that i went to the frogs mountain. The next time we meet, i will be a little different. But fear not. I will still be your Naruto-nee-chan. Good night, Konohamaru."
The next minute, in the light of the moon, the windows have opened, and like the wind, a figure appeared. Naruto looked sadly at the figure, then slowly took Konohamaru's head from her lap and put it on a pillow. Kissing softly the child forehead, she was lifted in the figures arm and they took off.
"I see that that child still is stuck with you." The figure spoke.
"Yes. It's the last comfort that i have. After you've leaved, only Konohamaru really needed me at all. If you're jealos, it's your fault, Sasuke."
"Hn."
"Don't 'I'm not jealos, dobe.' me."
"I still don't understand how you understand what i'm saying."
"You don't know? I speak fluently Uchiha language."
Naruto's head fell on Sasuke's shoulder, her eyes travelling on his face.
"Why are you carrying me? I can walk, you know."
"I know. It's just because i want to."
"Oh, my little Sasu-chan wants some pshihical contact. Want onee-san to comfort you?"
"You will do it later. That's why i carry you now. Now shut up."
"Hai, hai." Naruto paused in her studying the male's face to think. She knew what it would happen later this night. She knew from the moment that he leaved her on the Valley of the End, half awake, when he vomited blood and he whispered only for her to hear: "When i kill Itachi, i will come back to you. Then we can start a family. Goodbye." He promised her that she will bear his offsprings when Itachi was dead. Only that he wasn't. Not that Sasuke knew. Oh, god. Sasuke killed his brother. Most likely, since he went after Gyuuki, he knew the truth. They arrived at a safe house.
"This is...?"
"It's an Uchiha safe house made during the war. It's under a genjutsu that only an Uchiha can see through."
As he spoke, he took her in a room where the light was only made by a tourch. There was a bed, big enough for two. He put her down on the bed while he turned to close the door. He returned without the hood and cape he wore when he took her away.
He kneeled in front of her, and kissed her knees. She was wearing a black one-piece night dress, so unlike her stile. Konohamaru said she was beautiful. She was supposed to be beautiful. It was the night she will give herself to him.
"Are you cold?" Asked quietly Sasuke looking at her softly.
"No. You're here. I don't really fell anything beside my feelings for you when you're with me."
"And these are?"
"It's a secret. You have to beg me to say it."
Sasuke was getting close to her face by seconds. With ease and sincerly, he kissed Naruto. And again, and again, and again.
"Naruto..." murmured Sasuke in her neck. He now stood by her side playing with her hair.
She knew that she wasn't supposed to answer. Not now. So she didn't. She let Sasuke to slowly undress her, him kissing every part of skin his fingers trailed. He muttered her name for many, many times. She let him. He needed her. Needed a warm body to assure him that he's still alive, and that he's loved. But the tone he used... he was crying without tears. Bleeding without blood. So she cried for him.
"Why are you crying, Naruto? It's because of what i'm doing to you?"
"No...not because of that. I am crying for you. And you know it."
"Hn."
"Sasuke...i-i love you. I always loved you and will always love you. Even if you kill me. I will love you. I give myself to you. You too. Give yourself to me."
Sasuke stopped with his kisses between her breasts. He breathed her scent slowly. He knew that he too, loved her. He has from the first sight. And will always be. So he trusted her. Trusted her with his all. As she did.
"Naruto, i love you. I love all of you. Your scent, your big voice, your blue brilliant eyed, your shiny blonde hair."
"Sasuke, what do you need me for?"
"...to love me. Naruto. I killed my brother. I promised you that after i kill my brother, i will come back to you. Something happened. And now i regret ever killing my brother. So please. Naruto, i beg you. Please don't ever leave me alone. Ever. You're mine after this night. Forever."
"Yes. It's good that way. I love you. I will never let you down or leave you alone. I am yours and you are mine. That's way, it's ok. You can do anything you want to me."
So without any other words beside each other names, Sasuke continueted to workship Naruto's body. In the morning, no one will know what will happen. But now, they were together. That was good.
After another 3 or 4 hours, Naruto was standing in Sasuke's arm. They were both tired. Naruto's hand was carresing her stomach.
"Why are you feeling your stomach?"
"Kyuubi helped me to become more aware of what happens inside my body. Now i can feel how our children are growing. It's an amaizing feeling."
"...children?"
"Yes. Twins, it's seems. Even if it's early- like, really really early- i can feel it. I probably didn't mentioned before, but from the time that i could control Kurama's chakra, ii could see piece of my future. Or whoever future i want to see."
"Then what will our children future be?"
"...briliant."
"Then i'm glad. I never mentioneted, but you look really good in black. Like, really good."
"Ho? That's new. But Konohamaru said that too."
"Again with that brat?"
"Hey. Kono-chan is part of my family."
"Yes yes...Naruto?"
"Yes?"
"I love you."
"Love you too."
Like that, for one week they stayed inside that house. Loving each other, talking with each other, and enjoying the peace. But one day, after one week of peace, Sasuke leaved Naruto sleeping while he went toward his team, to hunt Danzou. He sealed the house, knowing that Naruto will soon get out.
At Akatsuki's base, Madara asked Sasuke where he went. His team was behind him looking confused at him.
"I went to make sure that i can kill Danzou."
That seemed a good enough of reason for him to get out.
Back in the Iron Country, Kiba shouted loud, poining his finger at Naruto.
"Ahh! So that's why your scent changed! You're gonna have puppies!"
"Kiba! Kid! Not puppies! At least use the form 'kits' if you want! But not puppies!"
"Same thing." Akamaru wasn't thinking the same.
"T-then, the father is Sasuke-kun?" Hinata asked blushing like crazy.
"Of course. Oh, yes. Itachi. I have two presents for you. One, as you've heard already, you will be an uncle. Two, later, ok? Now. Off you go."
"Eh? W-wait, Naruto-him-!"
Before he could say anything else he was sent back to frogs mountain.
"Now, we have to get back at the summon, right? I will attend, as godaime's substitute."