Teenage versions of Emma and Regina appear in Storybrooke and to everyone's surprise the girls hit it off immediately... "We have to stop this, Emma. She can't fall in love with the younger you. She has to meet Daniel and fall in love with him - his death starts it all. Or otherwise, Regina won't grow up to cast the curse, Storybrooke won't exist... and Henry will never be born!"

Emma and Regina have been secretly dating for nearly a year, and come Christmas time, Emma gives Regina a gift that helps them put a label on things

Regina's gut twisted with an agonizing pull and, for just a moment, she thought she might need to take up the same position as the woman crouched before her. "You're pregnant?" she whispered grimly. Emma's only response was to turn and retch into the toilet again. — Swan Queen, magic!pregnancy

Snow&Charming are the parents of Emma&Ariel Swan, also the Queen&King of Arendelle. Their daughters have special powers. Theres an accident&they have their girls powers bound. It worked w/Ariel, but Emmas powers are too strong. Secluding her til her 21st birthday. They invite everyone, including Henry&Cora. Theyve a daughter w/a power. Princess Regina has power over fire.

Lady Regina unknowingly helps Princess Emma prepare for her ball

An unexpected secret draws the girls closer.