While happy times did return to the Potter family after Ophis was summoned and saved Blake's life, they didn't last for long. One fateful night changed many things. The defeat of a dark lord (for now at least), the loss of a family, the birth of a misinterpreted prophecy and legend, and finally the awakening of less than a mere fraction of the Infinite Demi-Dragon-Goddess's power.
Even though the amount of power unleashed was less than a mere fraction of Blake's full power, it was still far beyond the power of a human witch. Power that struck fear in the manipulative old man that was Albus Dumbledore, the leader of the so-called light. And it was because of that fear serval extremely powerful magical bindings were placed on Blake's magic. Something that was futile since the power of infinity can't be tamed by anything other than only two beings in existence. Ophis, the Infinite Dragon-God, and it's daughter, Blake Ophis Potter, the Infinite Demi-Dragon-Goddess.
Being the manipulative old bastard that is Albus Dumbledore, the old wizard sent the twins to separate locations. The boy, Charlie James Potter, was sent to the wizarding family known as the Longbottoms, and his sister was intended to be sent to Petunia Dursley (née Evans), Lily Potter's sister, but she never reached her destination, having been intercepted on the way to Privet Drive.
The only clue that the headmaster of Hogwarts school of witchcraft and wizardry and his followers had gotten regarding the status of the sister of the so-called Boy-Who-Lived was a rather insulting letter addressed to him. The only provided them with the name of the person that took Blake, who claimed to be the girl's mother, which they obviously didn't believe in the slightest. And that name was Ophis. No last name. The only other thing that could have been considered a clue was the crest of the seal of the envelope. A pair of snakes biting each other's tails, forming a stylized infinity symbol with the center of the symbol at the center of a circle. But it proved to be a fruitless effort as no wizarding family in the entire Wizarding World had such a crest.
Elsewhere, basically in the middle of nowhere, two beings of incredible power could be found watching the sunset in the distance. One was an entity older than the universe itself whose chosen form was that of a young girl. The other was the entity's child, daughter to be more specific, who was nearly the same as her parent's chosen form in terms of appearance, albeit being much younger. These beings were Ophis, the Infinite Dragon-God, and its daughter, Blake Ophis Potter, the Infinite Demi-Dragon-Goddess.
"Hmm. Now this is an unexpected but interesting development." Mused Ophis as it started to subconsciously cradle its daughter in its arms, who was asleep. "Interesting indeed. Hmm… they'll probably won't need me for a few years, they've managed without me for a few millennia already so what difference would another few years of absence make?"