IT'S GOOD
Spoiler:
I have the same sentiments as tomohisa. Since it's a split peraonality and accd to my psychology class, this is considered a completely different person/identity. If this is the case then yuuta is tomohisa's child and is mentally a baby. Technically, he's having sex with a minor and his son. But it's also his Lover's body, which is a full consenting adult. It's problematic and not at the same time depending on how you view it?????
Kingyo no Ubugoe