"If you cannot survive this world as you are, I will fix you."

You're unknowingly trapped in the Upside Down, physically dying from the toxic atmosphere as fungal spores rot your internal organs. Henry, deeply in love with you, keeps your mind comfortable in a peaceful dream with him to shield you from this horror, but as the decay begins to effect you in the illusion, he is forced to expose the lie to save your life.

He uses his powers to rewrite your biology, merging you with the hive mind and transforming them into a creature capable of surviving the wasteland, saving you while permanently destroying your humanity and your trust.

Requested by @medusa_applogist, who has a perfect name. <3