So, JaneyKatherineHummingbird wrote this adorable fic on AO3 about F!Kirk/Pike and how people thought that Chris was the grandfather to his and Kirk's child. I couldn't help but think up some other occasions where that might happen.
I'll mark it as complete but I'm sure I'll keep adding to it.
"Are you and your daughter ready to order?" the waitress asked him. Chris looked across the table and watched as Jim tried her damnedest not to burst into laughter.
"Can you give us a minute?" he asked. The woman smiled at him before walking away. "That's not funny."
"Of course it is, dad," Jim chuckled.
"Don't ever call me that again," Chris said with a laugh of his own.
"I don't know why people keep thinking you're my father."
"I am twice your age."
"You don't look like it. Or act like it," she said, her too blue eyes looking him over. "Besides, you're only as young as the woman you feel and you do a lot of feeling." The fact that either of them made it to work that morning was a damn miracle considering how carried away they got in the shower. Then again, some days were just like that. "I think she likes you and it's easier to wrap her head around the idea that I'm your daughter."
"Could be. Or it could be an honest mistake," he smiled.
"We could make out on the table and see what kind of reaction we get," Jim offered.
"As much as I like the idea of ravishing you right here and now, we'd probably get arrested."
"But it would be so worth it."
"Have you made a decision?" the waitress asked as she stepped over to their table, clearly annoyed about something.
"Ah, yes. My fiancée and I will each have the special," Chris said. As expected, the waitress looked at Jim but Jim was looking at him with 'fuck me' eyes. Her head resting on her hand, the aquamarine engagement ring that once belonged to his mother sparkling in the light.
"Excellent choice," the waitress said, containing her shock, before walking away.
"You are naughty," he chuckled.
"You like me that way."