Okay, this won't be easy.
1. I don’t quite understand why Hibiki started doing such things to Shishio(srry Idr his name correctly). The boy's condition is understandable. It is not clear why he is not being seen by a doctor (or we have not been told about this yet). It’s unclear whether Hibiki is appetence to children (I hope not). It is not clear whether Hibiki felt any sexual attraction to the boy at all, because based on the boy’s behavior, I would rather assume the development of a strong adult attachment to the child, strong guardianship and concern, but not sexual attraction. (or they didn’t tell us everything). If Hibiki didn’t have problems with this in life, the only conclusion that so far suggests itself is that it was necessary to stabilize the boy’s psychological state. (So I hope Hibiki is good boy)
2. Rio very randomly falls into this relationship to my eye. basically, which is what Hibiki is saying in a sense. His attachment and state of passion are quite understandable. but it turned out too easily that the guy liked the first guy he came across, sleeping with another guy in the next bed. this raises questions because the Shishio situation was well thought out, but Rio didn't seem to be thought out so well. at least, he didn’t do anything out of character.
3. Why there is no drama in the tags at such a beginning is another incomprehensible thing.