Just gonna say, you shouldn't read the story if shotacon bothers you. It's clearly tagged as shotacon; if Shuuji just looked young, it wouldn't be. Don't complain about it in the comments. The story was really cute! It's a classic case of don't like, don't read.
*is waiting for that "hot summer"* ლ(´ڡ`ლ)
ლ(´ڡ`ლ) yumeeeeeee!!!!!! hahahahahahha lol