The length of time that passed between the day in the park and the next time Castiel was called to earth to spend time with Dean was about a year. Cas was happy to drop all of the official business of Heaven and go to spend more time with the Winchester he had grown attached to.
'What is it this time?' he asked, grinning as he joined Dean and Sam at the booth they were seated in at a rustic diner.
'Hey, Cas,' smiled Dean. 'You remember how the first thing you had when we met was a hamburger?'
'I do remember, yes,' replied Castiel as he drew up the memory of that night. He had enjoyed the taste immensely; it wasn't like other foods he had tried.
'Well, I think I just found the best hamburger ever,' he said, eyes wide as he gestured to the meal in front of him.
'Is it really that good?' Castiel asked humorously. 'How many burgers have you eaten in your lifetime so far? Because surely there is not that much to compare to.'
'Oh shut up, Cas. Seriously, it's fantastic.' Dean slid the plate so it was resting in front of the angel. 'Try it.'
Castiel turned to look at Sam, who was smiling at him and waving. 'Hey, Cas. It is pretty good. Dean gave me a bite of his because I took salad instead.'
'Health nut,' Dean whispered under his breath.
'Shut up, jerk.'
'Whatever. Try it, Cas. For me?'
Cas looked to see Dean pouting at him, and the sight was a mixture of comical and yet endearing. 'Fine,' he sighed, as he picked up the food. 'I shall try some.' He took a bite of the burger cautiously, and felt the familiar taste flooding his mouth, except this time, it was at least ten times better. He turned to look at Dean, who in turn was looking at him intently, and nodded in appreciation. He finished his mouthful and swallowed before speaking again.
'That was amazing.'
'Want your own?' Dean asked, before motioning to a waitress nearby. 'Can we have another one of these stunning burgers, please?'
'Sure thing, sweetie,' she smiled and noted down the order before bouncing away, blonde ponytail swaying gently as she walked.
The two boys and the angel talked about how each of them had been while they waited for Cas' order to arrive. Cas had been busy in Heaven on 'official angel business', as Dean called it, and the Winchesters were looking after each other.
Eventually the extra burger arrived and Castiel immediately began to eat. The table fell silent for a while, each of them wrapped up in their own meals.
It wasn't long before they were all done, and Dean called the waiter and handed her over enough bills to pay for their meal.
'Where did you get those?' Cas asked, intrigued.
'Stole them from dad's wallet. He wasn't gonna use them, and me and Sammy felt like eating out, so.'
'Okay.'
'You probably have to go back now, so…' Dean trailed off.
'I think I do,' said Cas sadly. 'I'll come back again soon if you need me soon.'
'Thanks, Cas.'
'You're welcome, Dean.'
And with that, Cas said goodbye to his friend once more and left.