"Don't forget me…"
"Oh, Sarah… Don't you forget me."
As if she would ever be able to even think about forgetting him. The Daleks, the spiders, all the adventures might grow hazy eventually, but every detail of the Doctor was implanted firmly in her head. No matter where she ended up, no matter what she did, there would never be a day when the Doctor didn't enter her mind. The toothy grin, the mop of curly hair, the ten foot scarf that somehow never got in the way.
That would all remain with Sarah for the rest of her life.