(For this story, I wanted there to be a girl older than the typical three, Emma, Louis, and Hugo. I picked the name Horatia because it means timekeeper. The last name, I just picked from a list of common French last names.)
"I cannot stress how lucky we are to have real time travelers grace the halls of our school. You kids had better appreciate them and learn all you can while they are here." The teacher gushed.
"Are you really part of the superhero team?" A student asked the woman in front of the class.
"I am, but it's really not as impressive in my time as it is right now. In the future, we're contracted to have superheroes patrolling the city at all hours, but we still have normal careers to attend to, as well as rest and leisure time. To accommodate, our staff has grown to upwards of 100 members."
"Dude, are you okay?" Nino was a little creeped out by how intently his best friend was watching the woman from the future. "I understand she's attractive, but you have to remember that even if she looks older, she's actually about fifteen years younger than us. Besides, if I'm not mistaken, I think I heard her mention being married."
Adrien shook his head vigorously, snapping himself out of his trance. "You're misreading me, that's not at all what I'm feeling when I look at her. It's just... there's this strong emotion that I can't quite interpret myself. Even if I've barely know her, I can't help but love her, in a way I've never experienced before. It feels the most like the way I love my parents, but inside out... and backward. Plus, the way she smiles, it's making me think of someone else, but I'm not sure who."
"Aaaaah!" The boys' attention was drawn out of their private conversation as one of the child visitors broke away from his group, making a clumsy attempt to get up the steps into the ranks of the class. In fact this toddler, looking to be around a year and a half, maybe two, seemed to be headed straight for Marinette. Marinette looked wide eyed and the child, who latched himself onto her leg.
"Hugo!" the woman scolded gently, going to get the boy. "Please don't bother Mam- er, Marinette."
"That boy looks a lot like you," someone noticed. "Is he yours?"
"No," the woman shook her head. "I do have a little boy of my own his age, but this is actually my little brother."
"Wow, then your family is very spread out!"
"Yes," she agreed. "I was an early child for my parents. Too early in fact. I admire them for it, but they sacrificed too much to have me at their young age. I can't expect them to do it again. They already told me that it was during this visit that they found out I was their daughter, so I've decided, this time, I won't tell them who they are. That way they'll never feel obligated to conceive me, and I'll painlessly fade from existence. Everyone would be better off if Louis were their first born, and Emma could be their eldest daughter."
"Horatia, wait!" Adrien ran after the woman. The entire day she was visiting his school, he hadn't so much as said a word to the woman, but now, he had to know if what he was thinking was true. All the other time travelers had already passed back through the gate into their own time, and she was about to follow. If he let her go with out talking to her, he had a gut feeling that might be as good as killing her.
"What is it?" she asked.
"I have to know. What is your last name?"
"Durand," she answered, then laughed, "but you wanted to know my maiden name, didn't you?"
Adrien nodded.
"Tough, you're one of the two people I want least to have that information."
"But I already know. You were born an Agreste, weren't you? That's why I feel this way toward you. It's the paternal love a father can't help but have for his daughter. Why do you want me to give up that bond?"
"You can still have that special bond - with my brothers and sister - when you're actually ready to be a father. I'm an anomaly, you and Maman would have never chosen to have a baby at this age - except you met me from a previous time loop, and decided it was your duty to give life to me again. If you just let the window of conception pass without touching my mother, my existence will become impossible, and the knowledge that I ever existed will fade from your memory. Can't you understand? You won't miss me. I know I can't change your mind now that you know, but luckily you don't know who my mother is, and she doesn't even know herself, so there's nothing you can do to stop my existence from being erased. Goodbye."
"You're wrong!" Horatia was once again stopped from going through the time gate by another voice calling out to her. "I followed you here too. If Adrien can instinctually know that you are our daughter, don't you think the same thing would happen to me too? I feel the same way he does. We're your parents, we'd rather die ourselves than lose you."
"Marinette..." Adrien murmured the name of the girl who had appeared out of nowhere to stand beside him. He realized it now, the familiar smile he'd seen on Horatia earlier was Marinette's smile. Neither one was smiling now. Mother and daughter locked horns ferociously in a battle of wills, they seemed an even match for each other, but it was two against one. Adrien had no doubts about taking Marinette's side.
"I get the idea this rotation is no different than any other time," Adrien told his daughter. "You undervalue how much we love you, so you probably try to erase yourself every time, but every time our hearts tell us who you really are. Of course there's a certain price we have to pay for for parenthood, but don't even begin to think you aren't worth it. In fact, we're being given the bargain of a lifetime if we can even hope to have a daughter as strong and compassionate as you. Knowing you would give your life for our happiness only makes us value you more."
Horatia stood with her mouth open, tears threatening to roll down her face. "I never wanted my life to end here, I just thought it would be selfish of me to ask you to keep me alive. I'm sorry misjudged you so badly. Thank you so much for being my parents, thank you for my life."
"Don't worry about it. You will be born on time, that is a promise."
After a heartfelt goodbye, Adrien and Marinette watched as their daughter finally did disappear through the gate back into her time. "I could have never guessed this morning that today would turn out like this," Marinette sniffed. "Now I will never feel complete again until we've had her."
"I know how you feel, but we're going to be fine. We're old enough to get married with parental consent, and her birth date is almost a year from now, we have a few months to prepare for this." Adrien felt a duty to reassure her, even as his own heart raced.
"I promised her we'd have her, and I want to, but what if we make a mistake? What if we have the wrong baby? I could get pregnant with a sibling to her, or even, a baby that was half her! I've only got one egg per cycle, so we should be able to pick the right one, but we have to time it perfectly or a different sperm could win the race!"
"Stop, whatever we chose to do, it's probably the exact same thing we've decided on in past timelines, and we had her successfully those times, it will happen again."
And so the couple continued to plan how they would prepare for their first child, and even as they finished, somewhere in a distant timeline, they were starting the same conversation just a few minutes behind. So be sure, at any given moment, there is a somewhere where they continue to hold this discussion to this day. And they lived happily ever after.