The day began like any other for the Doctor and Rose. They woke up and met each other in the galley, where they had breakfast and a small kiss. Ever since the Doctor's meta-crisis twin used the Chameleon arch on both himself and Donna to turn themselves into full Time Lords, the Doctor and Rose stopped ignoring their feelings towards each other and married. They had the TARDIS alone for the moment, because John and Donna had taken a fancy to tour a little village called Godric's Hollow the day after Halloween and to visit an old friend of Donna's.
John Smith, also known as the Doctor's twin, was walking in Godric's Hollow with Donna when she stopped in front of a house and began to cry. John's face paled in shock as he saw the Dark Magic that caused the roof to explode. He gently pulled Donna away from the house and started walking her back to the TARDIS when they both heard from the shrubbery next to them the wail of a child. John saw the baby with her red hair in a basket. He pulled out the basket and showed the child to Donna.
Donna looked at the child and said "She has Lily's hair. She's Lily's little girl, Jess. Hold her for a minute?" Donna gave Jess to John and placed the basket on the ground. She pulled out a stick of wood from within her purse and pointed it at the basket on the ground. A light flashed at the end of her stick and the basket changed into a wicker pram. Donna then took Jess from her blanket and transfigured it into a soft pillow, a piece of self-cleaning bedding, and a blanket. She then placed these into the pram before taking the baby back from John and placed her in the pram, covering her with the soft blanket. She looked at John, who was deep in thought because of what he just witnessed.
"You are a witch." He looked at the wand and pram. "You've been hiding this from every one you know, including your mum and granddad. Why?"
"At the beginning of the First Wizard Civil War, I decided to obliviate my Mum and Granddad so they didn't remember that I was a witch like my Da."
"You did that to protect them?" John was shocked, but not as surprised as he was to realize that she was a very good actress. "You've been holding out on us this whole time! Of course! That's how you got the second capsule in time, you used that stick thing to call it to you."
"First, yes. I hid this from you, and I am sorry. Second, it is a wand, and you better watch it before I turn you into a dog. I might forget to turn you back."
John swallowed nervously before saying "What can you do?"
"I can do almost any charm or spell ever created except for the three banned spells, and I am a Potions Master in my own right. I also can do wandless magic, so if I get mad and I'm not thinking, I can cause the MoM quite a large headache." She grinned, remembering he times spent with the Marauders, learning how to become an Animagus.
She said "Stand back real quick, I need to show you something." She grinned before crouching down. She changed until John stood before a Jaguar whose fur had a subtle tinge of red to it. It rubbed its head against his leg before swatting him with a paw on the arm before turning back into Donna again. "I'm also an unregistered Animagus. I can turn into a Jaguar. My friends could turn into a dog, a stag, and a rat. But one of them is gone now."
John sighed, and asked Donna "Would you like to return to the TARDIS now?"
"Yes. Now I have to explain this all over again to your brother and his wife." she groaned as she pulled out her mobile, which she used to call Rose "Hey, Rose. Yeah, we're heading back now. See you and the Doctor soon."
She closed her mobile with a snap before looking down the street to see a man in purple robes with a white beard appear with a crack. "John, take Jess to the TARDIS, I'll catch up to you in a minute." When she saw that he was going to protest she rolled her eyes, and grabbed him along with the baby and apparated them to an alley near the TARDIS. She pointed "The TARDIS is that way. I need to do something."
She walked away and apparated so she was within feet of Dumbledore. "You were supposed to keep them safe, Professor!" She screamed at the old man she'd looked up to when she was a student. "Now Lily and James are dead along with Harry, most likely, leaving Jess the only member of her family to survive!How can you justify this? You utter Bastard! If I see you anywhere near me, my brothers, or my sister-in-law, I will use the killing curse and I will not miss!"
Dumbledore said quietly "Jess survived? Hagrid had found only Harry last night."
"You trusted Hagrid? You are going senile, old man! He didn't know about Jess because she's only three months old! All he saw was Harry, dumbo! And no, you are not taking Jess away from me. She will be raised by me and my brothers." Her tone of voice brooked no argument. She walked off and apparated into the control room with a loud crack.
John and the Doctor looked at her in stunned silence while Rose snorted and said "Gryffindor?" Both men looked at Rose in astonishment "What?" she defended herself "It's not like you ever asked me if I was a witch."
"Ravenclaw?" Donna asked in turn as she walked over to Jess in her pram.
Rose shook her head "Gryffindor. I wasn't of the right mindset for the eagles."
Donna snorted "I would hope so. You are far too brave to be anything but a Lion."
"So... do we tell them or just give them our school books and let them learn everything the hard way?"
"Let's give them the books. It'll be fun to see them pull their hair out in frustration over not knowing about us before."
Donna and Rose shared a smile and pulled out their wands and said together "Accio Hogwarts School trunk!" From both of their rooms came two fist-sized boxes that flew over to them. Once they dropped to the floor in front of the two witches. Donna put her wand away and said "Engorgio." all four trunks returned to their proper sizes.
Rose looked at her in awe before whispering "You can do wandless magic? Who are you, really?"
Donna smiled at Rose "I am Potions Mistress Donna Noble, Half-blood witch, unregistered Animagus, and probably the only witch that scares our former headmaster."
"Why didn't you fight Voldemort yourself?"
"I did, but he almost killed me, so I will never choose sides again."
The silence was palpable as Donna opened her trunk and lifted out a black bag marked Books and tossed it to John who opened it up and exclaimed "There's a whole library in here!"
"Yes, now you go take those and read up on who we are, both you and the Doctor. Go on. Shoo!"
The Doctor and John left to go to the library until they finished reading all of the books on the two Witches that they had been living with without knowing.
Donna and Rose asked the TARDIS to create a room for Jess, where they took the tired baby and took turns watching her, while the two men continued to read all of the books Donna had given them for a month after.