/jp/ - Otaku Culture

Preface: Satoko is a pure girl for her age and has no sexual feelings towards Rika. She does, however, love her deeply. Even if those feelings are partially born from her unresolved childhood issues. Even if those feelings devolved from familial love to mania.

>>33910127
>>33910260
That sort of thing is called a shinjuu even in legal text. In that context "double suicide" would be better interpretation, but the kanji are very romantic. It's literally "in my heart".
https://jisho.org/search/心中

And since it was Satoko's first time, it was special. I think she was scared of death (even if she didn't show it) and, obviously, embracing Rika eased those feelings. That shinjuu forever linked their fates together. If that isn't the most romantic thing ever to you, get the hell out of my face.