After reading some good Portal fics I felt inspired to try my hand at one. So here is my attempt.
It never took him where he wanted to go, only where he needed to go. And someone desperately needed him now. It could feel their emotions cry out across space and time, it could feel everything. And so it homed in, following those feelings to the source, to a small, blue planet.
It was a gentler landing that usual. Fantastic! No matter how many times he did this The Doctor could barely contain his excitement. A new place and time to explore always had something exciting in store for him. He knew where he had set the TARDIS to go, so he didn't even bother checking the scanner before dancing over to the door. Of course, that didn't mean he was necessarily where he had wanted to go, but all the better! He loved surprises.
With a bit of a dramatic flourish, even though no one was around to see, The Doctor pushed open the doors of the TARDIS, eagerly awaiting whatever met him on the other side.
He was a little disappointed when it turned out to be just a cornfield.
This was surely not where he had planned to go. He had wanted excitement, adventure, not corn. Well corn wasn't all bad, even if it didn't hold a candle to fish fingers and custard. But still, under the bright yellow light cast down from the sun above, all that stretched out before him was a seemingly endless sea of tall stalks of corn.
Well, he tried to reassure himself; maybe he should go and have a peek around anyway, since you never knew exactly what adventures might be awaiting in corn. And after all, he did have all the time in the universe.
So he carefully stepped out of the time machine and into the sunlight. A fresh breeze rustled the golden stalks as well as his hair as he peered around. The door swung shut behind him as he took a few steps to his left, walking up to and peeking around the side of the TARDIS to see if anything more might be behind it than just corn.
He was genuinely surprised to see a girl standing a few feet away from the blue box. She had a lithe body, dark coloured skin and brown hair pulled back behind her head. She wore an orange jumpsuit over her legs with the top off and wrapped around her waist, a white tank top and a pair of strange glossy white boots with a metal bar on the back of each, keeping her heels off the ground. Next to her sat a large cube object, white with pink love hearts painted on. Behind her sat a small wooden shed.
She stared at him with her eyes wide with surprise.
"Oh, hello there!" he offered in a friendly tone.