It's a mixture of hearing Callaghan apologize, and seeing Tadashi - this person who doesn't even know him - putting himself into an obviously uncomfortable position just to try and comfort him that snaps Akito into action. He's being absolutely stupid right now. Yes, he's sick and feverish and exhausted, but Callaghan has done nothing but be kind to him even when he didn't have to be. And it's not fair. It's not fair to Callaghan. It's not fair to Tadashi, who is so clearly brand new to Keeliai. It's also not fair to himself, but that isn't something Akito even considers when making his decision.

...Okay, maybe standing up was a bad idea, because as soon as he's upright his legs decide to give him a big old fuck you and right back down on his butt he goes. Frustrated for so many reasons, Akito points at Callaghan and says as firmly as he can:

"You don't get to be sorry, because there's nothing to be sorry for! You've been like..." At a loss for words, he just uses his hands and gestures in Callaghan's direction emphatically. "If I had a real papa growing up, I would've wanted one like you."

And now it's Tadashi's turn - "And you! You're like... If Professor Oyaji didn't interact with you I'd totally say you weren't real. You don't even know me and you're helping me and you're definitely new here 'cause I would have remembered someone like you, since you're actually kinda cute and... You shouldn't be helping me! It should be the other way around!"

Akito can feel himself starting to get worked up again. Thinking about people caring about him, and him being such a mess and therefore, obviously, an inconvenience. He pauses; takes a breath. Repeats. "So, um... All I need is some help back to my apartment, and then I'll be okay. If... That's okay? Getting some help back home, I mean..."