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Side by side they sit in the doorway of their Not Quite as Big on the Inside TARDIS.
Rose shivers so the Doctor pulls her closer. She rests her head on his shoulder.
"Any second now. Don't look away. It is about to be born. The only known nebula that bridges two universes."
Rose blinks her watery eyes.
"And I burned up its sun to say goodbye. Grand enough gesture?"
She laughs through tears.
"The radiation must've seeped through the same fissure that I used--"
"No. You were on one side. I was on the other. Not science, Doctor. Love."