I do think that ain deserves to have a childhood. She’s the first person who has shown him genuine love and care. What’s sad is that he feels like he has to hide a part of himself from her to make sure she loves him.
Also, the MC is bad at reading children. Ain has had surprising reactions to things she’s suggested many times, and even though she noticed it, she just focused on his cute side and ignores everything that says otherwise. I hope that she can see him as a whole person, because at this moment, she’s treating him like a doll, and even though he clearly cares for her, he is playing her.