So I got an idea.

The idea wouldn't die.

Here's the idea.

Alcruz's supports

F!Corrin

"Hello Corrin."

"Good morning Alcruz."

"Might I ask what brings you to me today, milady?"

"I wanted to learn more about you. You've been in this army for a couple days now, yet you've racked up quite the kill count."

"I used to face much deadlier beasts than mere men. Although men can adapt, the beasts ad such raw power than even knowing how they ought made little difference."

"Oh? And what were these beasts?"

"Abominations. They shouldn't have existed."

"Wait, Alcruz I'm not done!"

"..."

"Huh. I must've hit a soft spot."

Alcruz and Corrin have achieved C-Support

"Alcruz."

"Corrin."

"I wanted to apologize for digging into your past."

"Don't. It's been decades now. I shouldn't have reacted like that. The wound is healed."

"Might I ask you more, then?"

"If you like."

"What kind of beasts did you fight?"

"Just about anything. The beasts were nightmares given physical form."

"..."

"I lost a child to them."

"What!?"

"Yes. Annabelle. She was just 7 when they took her from me."

"Alcruz, I'm so sorry."

"No. She has been dead for a while, and my vengeance has been enacted. There is no need for apology."

"You are a strong man, to not be broken after what you seemed to have faced."

Alcruz and Corrin have achieved B-Support

"Alcruz!"

"Hello Corrin."

"Don't hello me! What the hell happened that last fight!"

"Our conversation brought some bad memories."

"You charged straight into their front lines!"

"..."

"If I didn't know any better, I'd think you want to kill yourself!"

"What if I did?"

"Alcruz..."

"I haven't thought about my daughter for years. Talking to you showed me just how much my demons are haunting me."

"Alcruz. I swear-"

"I know, Corrin. But my life has no meaning anymore. All I love has died, or left me. Don't worry yourself with me."

"..."

"..."

"You're kidding yourself."

"Oh?"

"You don't want to get any closer to anyone, just in case they die."

"..."

"You have a new family. Me, us, everyone in the army. We all care for you, and you inspire us to fight harder."

"..."

"Every fight, you fearlessly charge into battle, beating impossible odds. Do you think that has no effect?"

"I..."

"Everyone in this army looks up to you. For your prowess, your stalwart ability to never stop, your determination."

"..."

"I look up to you. You showed me that anyone can be great."

"Corrin..."

"When you first joined this army, everyone thought you another soldier. A little weird and bit introverted, but normal. The very first battleyou fought in with us, you saved possibly everyone in the army. Especially me."

"..."

"That ambush would've certainly killed me, and a few others in this army. Then you joined the fight, and single-handedly held it off, allowing us to regroup, reveal and rejoin the fight."

"..."

"You've saved so many lives, Alcruz. Your romantic family may have died, and I'm sorry for your loss, but you have new brothers and sisters now, us."

"..."

"..."

"I get it, Annabelle."

"Alcruz?"

"Your father's an idiot. I know. But I'm okay now. You've opened my eyes."

"..."

"You saved me again. Your big dumb father."

"..."

"I'm so lucky to have had you in my life Annabelle. But it's time for bed now, Annabelle."

"..."

"You-you can't stay with your father all the time. He's got things to do, people to save, and you need your sleep."

"..."

"Don't worry, Your mother will read you your bed time stories now. Your father has some business to finish before he joins you."

"..."

"Yes, it's the nice lady Corrin. No, I'm not cheating on your mother, Corrin's my best friend."

"..."

"I'll be quick, baby girl."

"..."

"Goodbye Annabelle. Thank you. Say hello to your mother for me."

"Alcruz? Are you okay now?"

"I... I think so. Thank you, Corrin. I had no idea how much my survicor's guilt was burdening me."

"We're family. Family look out for each other."

"Family, huh?"

"Alcruz?"

"Yes, we are family. My-my new f-family..."

"Alcruz? Are you crying?"

"Yes. I need to move on. Corrin."

"My shoulder is yours, Alcruz."

"*sobs*"

"There, there. Your new family is here for you."

Alcruz and Corrin have achieved A-Support

"Corrin."

"Oh, Alcruz. Normally, I have to find you."

"I want to thank you for releasing my burden."

"It's no problem. You're an integral part of this army. We need you."

"..."

"Alcruz?"

"I've moved on now. I'm ready to accept people now. I want to accept you, Corrin."

"A-Alcruz?"

"It may be a bit sudden, but I hope you will accept this."

"W-What?"

"Corrin, will you marry me?"

"I-I..."

"I know I'm damaged goods, but you helped fix me, and your kind words helped free me from my suicidal mind. You showed the brilliance of a bit of optimism, and I want you to show me what I've been missing for all my grieving life."

"Alcruz."

"If it helps, I also think that you're incredibly beautiful."

"Oh, Alcruz."

"Yes?"

"Of course, I will marry you!"

"You will?"

"You're like a hero to me, and I can't help but love your selflessness, willing to give your life to save everyone, and your kindness!"

"I'm kind?"

"You may think you're hiding it, but everyone knows you give what coin you have to the beggars around. "

"Oh."

"I will marry you, Alcruz."

"I love you, Corrin."

You showed me the light, now I wish to share it.

Now, perhaps Annabelle would like siblings?