Siegfried and Lyla were the two now 15 year old siblings. And being in the family they were in, they were raised within the tradition of the illustrious Arendelle royal family. The two siblings grew up close, and were now; emotionally and physically, inseparable. Almost as if the two sisters swapped places, Lyla had Elsa's looks, and Siegfried had Anna's fire red hair.

Of the young couple, Lyla took charge. In fact, she grew up to be quiet the lustful and dominant princess. She enjoyed getting fucked by her brother and was raised to satisfy his needs, and that of her twin mothers when they wanted it. However, she focused quite heavily on her needs as well, and her family was more than willing to accommodate. When mood struck, she was the one that was serviced by her brother, and behind closed doors she ensured he would be her utter subordinate in the sexual relationship as well as the developing sibling marriage couple as well.

And right now, was yet another instance of her dominance over her brother. The two teenage siblings were completely naked in their shared chambers, and it was the man instead bent over and moaning. Lyla, inheriting the size of her mother, was utterly focused in plowing who she considered to be her little brother, her little servant. Her balls became momentary musical instruments as they bounced and slapped against their twin counterparts. Siegfried was exhausted, they had been at this since after dinner and it was almost midnight!

Still, he was far used to this by now. He grew up to be the secondary one in the relationship, as his sister grew to utterly dominate his heart, mind and body. His head was in the pillows, arms sprawled out as he moaned and moans, feeling his own balls against her with small white stains of his repeated ejaculations over the course of the night. It was no matter really, the servants had learned long ago to change their sheets daily. And further, it was really only his cum making a colored addition to the black and red bed they made love every night on. For Lyla's seed made its home in the deep crevices of his asshole, and the rest he dutifully swallowed.

Lyle was getting tired herself, her growing tits bouncing and her hands growing sore slapping his ass and groping it repeatedly. She enjoyed marking him, she adored knowing that such an insanely illegal thing not so long ago was common place across all households. Both commoner and royal, relationships within the family became so intwined that soon the idea that men shouldn't share themselves with other male relatives became obsolete. Sometimes, a father wanted to have their sons mount them as much as they wanted them to learn how to mount a horse. And the change in societal understanding was no different for the two crown children.

The son, who would be king, now was made the subservient princess to the Queen. Already, the political machine understood Lyla to be the new crown heir, and Siegfried made peace knowing his life shall be bending the knee to his sister-wife, slobbering on her cock when she needed and sitting on the secondary throne beside her. The issue of an heir became a non issue quickly, as Lyla became a second spouse to their mother, Elsa. Indeed, Lyla grew to become sexually active with every one of her family. Commiting sodomy with once innocent cousins, and laying wih both of her mothers regularly.

Lyla knew her place, of course. Just as Siegfried knew his, which was under her. So too was she aware that she was far from Queenhood, and she both loved and respected her mothers first. When she was raised to now present day, she became lovers to her mothers. Her being taught to be comfortable being a futa by Anna, who would then become a sexual partner to. And then being taught to become Queen eventually by Elsa, who she would also become a sexual partner to.

This was how the future heir issue was resolved. Elsa would carry the child of her own child, Lyla. An elegent solution, really. Why find a bride from another dynasty, with their own favors and drama, when they could keep it in the family for all eternity? To this end, and with the two siblings wedding coming up, the future of their own dynasty would be secured.

That was in the future, though. And presently Lyla was on her last legs further teaching her brother his complete position to serve her. Finally, groaning loudly and pulling his hair back to get further inside, she released her cum within his asshole. It wasn't too much, as she blew most of it throughout the evening, but it was still quite a few spurts of the see which would soon impregnate her mother. Leaning back relieved and more than satisfied, she fell next to her brother and held him. He was panting as well, and moved closer to her as he enjoyed being cuddled and pet by her. After a few minutes, Lyla spoke.

"That was great as usual Siggy, my balls are emptied out..."

"Gods mine too, my ass is so sore. I can feel your cum dripping out..."

"Feels good though, whew. Anyway, on your knees. I need to take a piss.

"Ah, of course." Siegfried sighed and smiled, he grew fond of the after-sex refreshment. Moving quickly like his future bride liked, he planted himself beneath her and took her soft mass in his mouth. Soon enough, a second hotter liquid came shooting out, and he did his duty as her little princess and swallowed.