She didn't realize he was behind her until his arms were about her waist. She looked up from the sink, toothbrush still in mouth. In the reflection of the bathroom mirror she could see that he was in nothing but his boxers, matching her similar state of undress. He ran one finger over the edge of her bra. Before she started drooling, she remembered herself and quickly spit into the sink. "Doctor, what are you doing?" Her tone was lightly teasing.
She resumed her brushing as he swept her blonde hair aside and exposed the side of her neck. "Just finding my wife unbelievably sexy, that's all." He dropped a kiss there.
"Wha..?" Her mouth was full of brush and bubbles. "Wol bwashin mah teef?"
He chuckled and kissed the other side of Rose's neck, sending delicious shivers down her spine. "Especially while you're brushing your teeth. Hygiene is a big turn on." He quirked a wicked eyebrow at her mirrored doppelganger.
"Aah" she replied, encouraged by the tone of his voice.
"Bedroom. Two minutes. Yes?"
She spit again. "Definitely." She grinned at him before starting to work on her back molars.
"Brilliant!" The Doctor turned in an excited manner to head out of the bathroom door, but not before grabbing Rose by the waist in such a manner that she erupted in squeals and spluttering.
"Doca!" She took the toothbrush out of her mouth again. "You're going to make me swallow my toothpaste!" She protested.
But he was already gone, and she could hear the familiar whine of the sonic screwdriver that he was using to dim the bedside lamps. She hurried her final rinse and was in the bedroom to join him in less than one minute.
She never got around to flossing that night.