Prompt: Cake

_{Set in the Switchverse.}

"I don't care what you say, Doctor, that's definitely not a cake."

"But Rose, looks can be deceiving. Just because it doesn't look like a cake, doesn't mean it's not a cake."

"And sometimes, it doesn't look like a cake because it's just not a cake." She laughed as he pulled a face at her, failing miserably at looking insulted. "Is that a cake?" She pointed at the stall opposite the food stall they were stood at. "Is that book really a cake? I mean that's some skill to make each page look like paper."

"Shut up." He nudged her with his elbow. "A fiver says that that so called apple is a cake."

"Ten quid says it's not." She grinned, knowing he wouldn't be able to resist. "And when the stall owner gets back we ask her what it is."

"Deal. Be prepared to lose your money, Rose Tyler."

She bit her lip, suppressing a laugh. "Oh yeah? Let's see what she has to say about it." She nodded to indicate the return of the stall owner.

A young woman with long black hair was peering at them from across the stall. "Can I help you?"

"Yes, you can help me win a bet." The Doctor grinned. "This fruit isn't fruit is it? That apple is definitely not an apple, am I right?" She nodded. "Ha! See, Rose? I win!"

She laughed, leaning into him. "No, our bet was whether it's cake or not."

"It is cake like." The woman interrupted them. "But I'm afraid your wife is right, it's not a cake, technically it's a biscuit."

Rose laughed. "Ha! Hand it over, ten quid please."

The Doctor looked down at his hand, the gold ring sparkling in the light. Wife. "How did you know?"

"Oh that's easy. I was talking to her about it earlier."