Sure.

I think Toya wouldn't actively seek out random children, he's very good at hiding his attraction and since his main interest is Akito whose family he's very well acquainted with he has no need to.

Growing up he often ends up babysitting the younger boy when his parents are out, and later on he tutors him since he's an exceptional student and Akito can definitely use some assistance.

The boy often brings him little trinkets, stuff that he's made in arts and crafts or even just rocks and flowers that he's found by the road, Toya keeps every single item he receives from Akito. His walls are covered with the boy's drawings, he's honestly lucky that his parents barely enter his room anymore.

Whenever the two of them spend time outside Toya makes sure to take his phone with him so he can take as many pictures of Akito as possible. He's pretty much the only thing in his camera roll. Not all of the pictures are taken with the boy's knowledge however, occasionally the high-schooler will take advantage of his free periods or days off to follow Akito around while he plays with his friends or walks home from school. All to make sure he's safe of course!

Sometimes Toya even finds himself sneaking a picture while Akito is in distress, like the one time he fell and scraped his knee, or when he was crying for help because a little dog had chased him up a tree.

Toya hates that side of him, hates that his first thought in those situations wasn't to help the younger boy immediately, but he just couldn't resist. He loves Akito, and Akito is adorable no matter what so why not document him in as many situations as possible...

Sorry if this isn't exactly what you had in mind that's all I can come up with for now.