After all, taking in Alwin was his own choice. Thus, Alwin did not need to give back anything.
The knowledge, skills, and strength they imparted were their own choice.
Sure, it was unexpected that they needed to raise a child all of a sudden, but they raised him of their own choice.
If they really did not want to, they could have returned Alwin to the elves immediately, regardless of Alwin's reactions or preference.
"I'm rather envious of these two who had been able to watch over Alwin much longer and much closer than I could.
If I could turn back time, I'd be the one to find and protect him.
I'll take care of him myself.
I will love him as my own son and give him everything I can," Alvis said, filled with regret and longing.
"As for everything I have done for him when I finally learned he was still alive, I know it must not be that important to him.
But even so, I never wanted anything in return.
Everything I did was because I wanted him to be happy," Alvis added.
