This is technically Jelsa but more accurately Jack X Elsa X Anna. This is not a romantic pairing but I urge you to read it anyway. Elsa and Anna weren't two of a pair of siblings, they were two of a trio. Jack gets back the rest of his memories and realizes that, in the rush to defeat Pitch, he missed out on the most important memory of all.
Mooney, Wormtail, Padfoot and Prongs weren't the only mischief makers in Hogwarts the 7 years they lived there. Lily, Severus, Regulus, and several others lived and learned in that castle. And there might have been a reason to why Sirius never married; after all, some loves last forever. This is the eternal story of Hogwarts; Friendship, bravery, love, family and finding yourself.
The Avengers are good at saving the world...but they need a little bit of work when it comes to being parents. Even if it is only for a few short months. But any adult would find it difficult to be a parents to a children with a mutant x-gene, especially when they have never been given a reason to trust anyone my each other...