This chapter is way shorter than the others. However, it does hit upon an always cute idea of the Robin/Lucina ship. It's not as groundbreaking as other people apparently found the other chapter, but I still like it. In regards to that kind of stuff, the next thing I'm trying out is a bit more of a long con. The effect isn't going to be as immediate as the previous two chapters. It's basically going to be the basic way people approach the ship, but with a different twist in one commonly used part.
Robin interacts with babies the same way I do.
"Ok." Robin said, pinching the bridge of his nose. "I know we might not have a great working relationship right now, but I think it's something we should work on. You have your own duties and I have mine, but we have to put our differences behind us for Chrom's sake. You care about Chrom, correct?"
Lucina blew a bubble in the tactician's face. It popped and she giggled.
"...Right. Why am I even in charge of this thing?" He asked himself, looking at the infant princess. "Aren't there caretakers or something?"
He knew the reason. Sumia wanted Chrom to take a day off, and the couple also wanted to have the day for themselves. They could have left the baby with the caretakers, but Sumia wanted her to bond with her family members. Usually, Lissa and Frederick would take the child. Naga knew they were capable enough to care for it. However, almost everyone insisted that Robin watch Lucina. Something about her bonding with her uncle.
Robin was both touched by the fact that Chrom considered him family and stupefied by the fact that he would consider a complete stranger family.
"Ok...What do babies do?" Robin asked himself.
As if in response to the question, the room was suddenly filled with a horrid stench.
Lucina wailed.
"Oh, come on!" Robin exclaimed, fumbling with various baby care products. "How do you even deal with this kind of thing?!"
As he managed to remove the diaper, there was a knock on his door.
He looked down at the baby. "Give me a minute. I have no idea what I'm doing. Maybe they do."
He left the baby in its own filth. He opened the door.
"Oh! Marth! Hi!" Robin quickly exclaimed.
Marth looked at him, confused. She heard the crying. "...You have a child?" She asked, a strange tone in her voice.
"Huh?" He looked back. "Oh! No no no!" He looked at Marth. "Do you know how to change a diaper?"
"I have some experience, but I-" She began to enter his room when the stench hit her. "Sweet Naga! What is that stench?!"
"It's me asking you to do me a huge favor." Robin replied.
Marth sighed. "How did you lead an army?" She asked, walking toward the source of the crying.
"Believe me, I didn't need to deal with this kind of crap." Robin assured her. "Literally."
Marth suddenly stopped when she saw the source of the crying.
"Why...why do you have the royal baby?" She asked, shocked.
"Sumia thought she should spend a day with her uncle Robin." Robin replied. "If you ask me, she just wanted an excuse to get nasty with Chrom."
Marth had a strange look on her face. "That's...uh…"
"Yeah, I don't like thinking about it either." Robin agreed. "Look, can you do the kingdom a favor and change Lucina's diaper?"
"U-Uh…" She looked down at the little princess, who was still crying. Marth sighed. "I suppose I might as well. She appears to be suffering."
As Marth went to work, Robin watched her. "It looks pretty difficult."
"It's rather simple if you know what you're doing." Marth replied. "Why not get one of the caretakers to help you?"
"Well, you were here, and you said you know what you were doing." Robin replied. "I'm surprised that Chrom would trust a stranger with his own child."
Marth laughed. "Say what you want, Sir Robin, but I doubt you are much of a stranger to the royal family at this point."
"You're probably right." Robin said. "Still you never know. So what is it you wanted to talk to me about, Marth?"
Marth finished with the diaper, and absent-mindedly put Lucina on her lap. The baby giggled happily.
"Well, I wanted to talk to you about the future of the…" She paused, noticing something was distracting Robin. "...Robin?"
Ordinarily, someone would be distracted by the cuteness of the swordswoman and the baby. While Robin did find the image cute, he was able to look beyond that.
He noticed how similar Marth and Lucina looked, right down to the Mark.
"...No…Lucina?" He said, slowly putting together the clues.
Marth looked at Robin, then at the baby, and realized her mistake.
"I should go!" She suddenly exclaimed, shoving the baby into Robin's arms. She quickly made her way to the door.
"Wait!" Robin exclaimed, only for her to leave. "Crap." He looked down at the baby. "Well, we should probably keep this between ourselves." He paused, looking at the baby. "...Possible older you is pretty hot, by the way. As if I needed to confuse myself even more than I already am."
I'm committed to writing Robin in a way that he's smarter than everyone else and know is. I feel like I'm constantly walking the line of making him too sueish, but it is kinda canon that he's smarter than everyone. I just make him a bit less graceful about it. It might be too much for him to figure out Lucina's identity, but I kinda think it works.
I would absolutely love to see an image of Lucina holding her baby self. That's not me making a request, consider the fact that it probably already exists.