I really do think he had a fleeting thought of making her completely dependent on him so she couldnt escape. Just having those thought without necessarily acting on them makes him a yandere if u ask me.
Might be a spoiler
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But tbh, I read some spoiler said that Isaac will be a ....kinda be posessive and obsesive towards Clea.. (￣∇￣") idk the full story, but his obsession to the point he would sacrifice thousands of soul just for clea
He already possessive and obsessive tbh
IKR????? Imagine how possessive and obsessive he is in the future...
i really thought isaac was gonna be a yandere when i saw him imagining her in chains