Disclaimer: I do not own Supernatural.
Forward To The Past
Before a human were two forms moving upwards together, a dark cloud and a divine light. The Darkness and God had just begun their journey towards full reconciliation. For a moment, their two forms established a shady side with a small sunny portion and a sunny side with a small shady portion. The next moment, they seemingly disappeared, but in reality shifted their state of existence from one plane to another.
Where they were, beyond even time itself, they shaped their true forms so as to make themselves audible.
"Brother, why are we here?" inquired the more feminine of the two entities, the dark cloud.
"Sis, when I said that you and I are just gonna away for a while," recalled the more masculine of the two entities, the divine light, also her younger brother, "I communicated only that which could be understood in human terms. Our so-called 'family meeting' can transpire in full within an instant, from the perspective of a created being. However, too much hostility has developed between us to be resolved so shortly."
"We could manipulate time across all Creation to almost, just almost, a standstill," offered the older sister, "Your first creation, time itself, is beneath us."
"Actually," countered the younger brother, "you and I could, well, teleport together across the past, across all manner of space and other planes of existence."
The former was surprised, to say the least, and made her surprise known. The last time that time travel had been suggested to her, she had been tricked into being sealed away.
"I know your shock," continued the latter, "but this time, how can this be a trick?"
The Destroyer took a moment to reassure herself. This time, her nephews, her brother's four immediate sons, were not available to weaken her. Neither were other supernatural forces available.
"We have, literally, billions of years of catching up to do," the Creator said somberly.
"Won't our absence, however brief it may be for your creations, have an adverse impact on them?" wondered the confidante.
"You and I can teleport at the same time, yes?" asked the confidant.
"Of course," affirmed the dark cloud.
"Then the balance underpinning all of Creation won't be upset," reminded the divine light.
The Darkness accepted God's offer, and together they shifted their state of existence back to a time-governed one and travelled back in time.