Imagine: 

You were eating out with Tony, having had rented out the entire damn restaurant just to have a peaceful lunch. You were telling a funny story about how you and your friend had broken into an old barn when you were teenagers, when you lifted your eyes to catch Tony staring at you with some sort of upside down smirk.  

It was hard to tell if he was simply concealing his laughter at the stupid story or if it was something else he was dying to say. Either way, you shrugged it off and continued talking, when suddenly Stark leaned over the table and captured your lips passionately with his own, taking you by surprise. 

You squeaked in shock at the sudden action, before kissing back. After a moment the two of you pulled away and settled back in your seats.

"What was that for?" you asked coyly with a smirk. 

Tony mirrored your grin as he responded with a shrug, "you had crumbs on your lips, so I had to clean you up." 

You laughed heartily at the quirky antics of this adorable man, before leaning back over the table, as it was his turned to be surprised. After you two shared another heated kiss, Tony nearly whispered to you, "did I have food on my face too?"

In which you responded a simple, "no," before you sat down to finish your lunch as Stark chuckled in the aftermath of your response.