The talk of Elsa having a child did make her heart flutter though, you see, Anna was a unique woman. Elsa was given the magical powers, and Anna was given the...magical cock. It was kept entirely secret from the public world however, even today. Only trusted family physicians were told, and even those were very few. Elsa however, had a deeper and a more intimate knowledge of Anna's extra appendage.
Indeed, the two had started an incestuous relationship soon after they extradited Hans back to the Southern Isles. Elsa felt true love for her sister, so when Anna nearly died, it gave her the courage to confess, because she couldn't live without Anna knowing.
The very night of the confession, the two made love. With her relationship with Anna, Elsa shot down each and every proposal of marriage with other kingdoms. Rumors sprouted, perhaps Elsa had taken a lover? They were right, in a way.
Elsa chuckled with her sister, and after undressing, she laid with her sister on the bed. "My love, I've been thinking about things and..." Elsa trailed off, and Anna looked concerned. "Are you alright sis?" Elsa shook her head of doubt. "I've been thinking about us. Horth was a fool on how he said it, but he has a point. The Empire would fall into turmoil if I died. I do need an heir." Anna sighed, her sister was right, she hadn't received the tutelage needed to rule, however she was interested in just what Elsa was getting at.
"I want a child. With you." Elsa sat up, her heart fully poured out to her sister. Anna was shocked. She knew that this relationship was unique. But she never once thought Elsa would want to go all the way. "I...Elsa I...I would die to be able to do this. I think about this moment every night, wanting to have this together...but...are you sure Elsa?" Elsa nodded, the political ramifications were too large to even comprehend. But she had thought about this though. She was the strongest nation in the entire region, and she was in a highly defensible position should another kingdom desire to put an end to this.
"I have, but who has the right to stop us? They would have to conquer us to even think about stopping us. And my citizens adore us, if we do this right we can survive and perhaps even...thrive..." Elsa caressed Anna's face, and kissed Anna.
Anna returned it, now holding Elsa and getting more passionate. Almost instinctively, the two started to undress, and Anna started getting harder and more excited. Her primal instinct of breeding started to kick in, and she lightly pulled Elsa down on the bed, getting in position.
"Elsa...are you sure?" Elsa nodded, her heart too was thumping, worried but ready for the future. Anna lined her cock up with Elsa's hole, she pressed in, and moaned as her head penetrated her sisters pussy.
Anna made out with Elsa as she started to get into a rhythm, the two siblings moaned in pleasure, precum slipping off of Anna's cock into Elsa, Anna was getting close, Elsa thought for a moment, "After this we'll be bound together, there's no going back after thi-" Elsa's thoughts were interrupted as Anna gave a warning she was about to release. And after a few moments, Anna hilted deep inside Elsa's core, as her female semen poured into her own sisters womb.
Anna collapsed next to Elsa, exhausted and filled with love. And Elsa cuddled with her sister, seed dripping out of her, as she too fell under sleeps spell.
The two weren't sure yet, but Elsa was pregnant with her Sisters child.