For anyone concerned about the Shounen Ai tag, while I cannot make any guarantee about future chapters, I can say that as of Chapter 8, the one I am currently working on, there is no erotic, or overtly romantic themes, instead so far the series is a mostly light hearted, safe series, with the few possibly romantic themes coming from the part of Tsubaki, the Shota, rather than from Yuu, the older boy.