Hiccup couldn't believe it. The person in front of him, the one person he never intended to find out, it was Rozemyne, or in this case, his long-lost twin sister, Kara. 

He sat all alone in the Cove, trying to process the discovery of his sister being alive all this time without telling him, he hears a familiar Nadder came in . 

"Hey, there you are." He heard a familiar voice as well, it was no other than Astrid Hofferson. 

"Oh, hey, Astrid." He greeted her, as she said, "I take it that Rozemyne told you, her true identity didn't she?" 

His eyes widen with pure realization that she must've known his deepest regret and secret that he had kept for so long. 

"How did you find out?" He asked her, as Astrid replied, "Rozemyne told us herself, about the day she was taken away by Sliver. 

Although, her tone, it sounded like she felt completely guilty about that happening. Hic, you're not at fault here-" 

"But it was! I was her older brother, Astrid, i was supposed to protect her from danger, for Thor's sake!

"Had you tell that to her? She is really sadden about it, Hic. You're brother and sister, but also best friends, just like you and Toothless are. 

Right now, she needs you to be by her side. Hiding your feelings aren't going to help you of your guilt of not protecting her . 

She needs a brother, go try talking to her. Make amends of your past together." 

"I don't know, it's hard for me, i don't know what to say to her. It's been too long for us to talk straight to one another now." 

Astrid was frustrated by his words as she struck him in the gut! 

"Ow! That hurts! Are you trying to make me feel more pain than I already had?" He asked. 

"Go back to her, you dolt! You may have to try again. You and your sister ... it's nice to be siblings isn't?"

Hiccup was amazed at her, but knowing how persuasive she was, he eventually gave in of her temptation. 

"Fine, you got me, Hofferson. Honestly, I can't believe of how wise you are with type of stuff. " 

He got up and then he went straight to Gothi's. 

He took a massive breath to know that he had to make up with Kara somehow. "Ok, I got this." 

As he opens the door, she was waiting, with the two night furies in tow. 

"Toothless, you were waiting for me to come here." 

The night fury literally jumps into his friend and licked him with slivia. "Ew, gross! Get off me bud." He laughs. 

He got off of the Night Fury to see his long-lost sister . 

"I guess that I owe you and Sliver an apology. " He said.