This is a little something inspired by KuroEngel_OG and I know you may think that it is more GoT than Vikings but given that the gods of Norse mythology were supposed to believe that incestuous relationships were a way to strengthen family bonds and ensure the continuation of the godly bloodline, I think it will work. Hope you enjoy.

They had always been together, even in the womb. Ivar born first, to be quickly followed by a girl that no one had expected. Aslaug lamenting over her son and his twisted, seemingly broken legs, though overjoyed by the tiny female that she quickly named (Y/n). The newborns fussing and crying until they were brought together. The two grabbing for one another, only settling when they held one another close. Yet it was when Ragnar had taken Ivar out in order to kill his deformed son, whom he believed would have no life, that all came to see that the twins had been truly bonded by the gods. (Y/n) screaming so loud for her brother, that Aslaug and her ladies were sure that even Asgard would know what was going on. It only when the abandoned Ivar had been brought back to her, that (Y/n) had stopped her screaming. A peace settling over Kattegat, as the twins were wrapped up together in the same blanket. And so, it had been ever since. The two youngest children of Ragnar barely ever away from one another. The only time that Ivar seemed eased from the pain in his legs, was when his twin was by his side; Harbard telling Aslaug, as he had looked over the pair that the bond between the two would only strengthen as they grew. That the godly bloodline was strong in her youngest children, and they would be as close as Odin and his sister, Frigg; the mysterious visitor cooing softly over the small smiling girl, who held his hand, as he eased the pain of her brother. No one knowing then how true the words of the big man would become.

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Ivar rolled his eyes as Margrethe came and filled Ubbe's cup. He, Hvitserk and Sigurd all smiling at the thrall, before she left the family.

"Why is it brothers, that despite how many women who call Kattegat home; all three of you only wish to sleep with one.......and the same one.........." Ivar asked, as he picked up his own cup. Nudging (Y/n) who sat by his side; his twin just rolling her eyes. (Y/n) not blind to the true motives of the girl; not blind to what it was the thrall wanted, nor what she would do, or who she would use, to get it.

"Are your jealous, brother.........?" Hvitserk asked, before pushing more meat into his mouth.

"Why would I be jealous.......?"

"Perhaps because no woman wants you......boneless........" Sigurd chimed in. Ivar placing his hand on his sister's, as he felt her tense at their brother's words.

(Y/n) had been defending Ivar for as long as she could really remember, against Sigurd; against anyone that would dare to say anything about her twin. The surviving daughter of Ragnar, much to her mother's dismay, having become a warrior just like her father, rather than the lady that Aslaug had hoped for; and given that, (Y/n) had had more fights than any of her brothers. Happy to prove to all that even though she was a girl, she should not be underestimated; and that no one, but no one insulted her twin. Sigurd being no exception.

"I doubt he would even know what to do with one. The cri..........."

"Say it, Sigurd..........." (Y/n) growled, as she jumped to her feet and drove her dagger into the top of the table.

"I dare you to say that word in front of my face. I dare you to insult Ivar........." Ubbe and Hvitserk sitting up straighter at the words from their sister. Ivar just smiling behind the lip of his cup as Sigurd turned pale. The dark prince always enjoying it when his twin would make their brother shit his pants in fear. His sister having the ferocity of a berserker when she fought, and she and Sigurd had fought often over the years. Their older brother coming away with more than his fair share of scars from the interactions.

"(Y/n), sit please. Sigurd won't say anything more.......Will you Sigurd.....? There is no need to fight......." Ubbe reasoned, looking to Ivar for help; but rolling his eyes as his younger sibling offered him nothing but a shrug.

"Ivar..........!" Ubbe continued. Well aware that the only one that could really diffuse the situation, was enjoying it, far too much.

"Fine........" Ivar huffed, before placing his hand atop his twins.

"It's alright, sister. Sigurd knows nothing, and his opinions mean little to me." (Y/n) turning to look at her twin who squeezed her hand a little tighter. The princess finally nodding, before retaking her seat.

"If you must know, I am not jealous. I am not jealous of any of you. Because I have a woman of my own. A woman that I do not have to share. She is mine and only mine..........And she is the most beautiful woman in the world.........." Ivar announced proudly. His hand slipping under the table so that he could place it on (Y/n)'s thigh.

"And what is this beautiful woman's name........?" Hvitserk enquired, sounding a little less than convinced by Ivar's words.

"That is none of your business.........."

"Because she doesn't exist.........." Sigurd scoffed. Crossing his arms over his chest as Ubbe glared at him. The oldest son of Aslaug not sure that (Y/n) could be stopped again, if Sigurd were to say any more.

"And what about you sister.........?" Ubbe asked, doing his best to steer the conversation.

"What about me..........?"

"Where are all the boys that we should be threatening to stay away from you........?"

"If you think that I would tell any of you if there was a man in my life, you have lost your senses. Even if I was fucking every man in Kattegat, it would be none of your business, as you are not our father. And given that between the three of you, you have probably had most of the young women here, you have no right to judge me either. Now........." (Y/n) explained, before she got to her feet.

"If you will excuse me; I have had enough of watching you all eye fuck your whore. I am tired........" She continued, placing a kiss to her twin's cheek. The pair of them giving one another a look, before she left the four boys in the hall.