"It's ceremonial," he had said. "Some kind of traditional love potion type thing. There's no such thing as a love potion of course, but tasty. Try it."
Rose had complied, swishing the spicy, fruity, crisp juice in her mouth. Then, she'd taken another swig.
"I think," the Doctor began, stroking Rose's hair as she dozed in the crook of his bare arm, "That it probably does have an effect." Rose opened one eye and looked at him skeptically. "I'd like to study it."
She huffed and burrowed into him, her leg and arm slung over his naked hip. "Git."