Is it cool for River to read your character's mind? Yep! Is it cool for her to talk about it? To him, yes! Maybe ask if she's going to tell others, though? OPTIONAL BUT HELPFUL: What might she find there? As Demyx lacks a heart, you won't find real emotions, though there are kind of faraway echos of them sometimes. Also, an intense longing to be a whole person. Would your character notice? Nope, not all.
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Is it cool for her to talk about it? To him, yes! Maybe ask if she's going to tell others, though?
OPTIONAL BUT HELPFUL:
What might she find there? As Demyx lacks a heart, you won't find real emotions, though there are kind of faraway echos of them sometimes. Also, an intense longing to be a whole person.
Would your character notice? Nope, not all.