"Wow, they're so pretty!" Rose awed at the alien wildflower meadow. The flowers were like nothing she'd ever seen. She bent over to smell a beautiful plant with 50-odd neon pink blossoms and sighed in happiness.
The Doctor slowed his steps down the path for her to catch back up, hands shoved in his pockets and shoulders relaxed, happy.
"Doctor, smell this!" She plucked the flower from the ground and he stopped walking, smiling at her, as she stepped over.
Rose shoved it under his nose and he drew in a long breath. "Yes, smells v-very hih-'
Rose frowned as his eyebrows raised, chest expanding. "Doctor?"
The Doctor held up a finger, signalling for her to wait, as he turned his head away.
"Hyih-SCHOO!" He snapped at the waist, sleeve-covered hands over his face. He stood up straight for a second, just enough time for him to fumble in his pockets and pull out his handkerchief, pressing it over his twitching nose. "Hyeh-CHOO! SCHOO!"
He rubbed his nose with the back of his hand, sniffing.
"You done?"
He nodded. "Think so, yeah."
"Bless you."
He pocketed his handkerchief with a, "Thanks."
Rose dropped the picked flower back into the meadow and linked the Doctor's arm, walking again.
"Sorry, didn't realise you were allergic," she said, smiling apologetically.
"Neither did I, matter of fact. I've never been through this p-particular..."
He paused in his speech, wriggling his nose around as another small tickle formed.
Sniffing, he continued. "-particular area b-before hah..."
He stood still, waiting, lips slightly parted and eyelids fluttering.
"H-hih..."
Rose waited, watching him.
"*snff* hah..."
His nostrils flared, he drew in shuddering breath after shuddering breath. The Doctor just wanted it over with by now, but it wouldn't come no matter how much he wanted it.
"Oh for god's sake. Just sneeze already."
"C-can't. I-it-hih.... it's s-stuhh... hah... s-stuck..."
Rose sighed, deciding. She reached up and, slowly, ran her fingernail along the twitching edge of his nose, circling it.
The itch flared exponentially, making him gasp, eyes watering.
"I-it t-tickles-HYEH-SCHOO! HASH-OOO! Huh... ESH-OOO! HET-SHOOO! HASSH-EWWW!"