It's a self fulfilling prophesy/cycle of abuse. Doesn't matter who started it, both sides are bastards trying to get back at one another.
Otherworlders have extra powers above the natives and have no connection or care to this world outside altruism. There's good reason to be spiteful since they were kidnapped from their own world. Said otherworlders are also horny teens given all the tools to fulfill a chunni fantasy. Gee, I wonder how all that rape could've possibly happened?
What this creates are natives who hate the beings they intentionally summon and treat them like shit because they've without fail turned into unchecked horndogs. The abuse then turns even good intentioned people into spiteful assholes and just creates more unchecked horndogs. "I treated the demigod I summoned like shit and now he's raping me! How could this have happened?!"
Oh well, the reader is here because of the erotica tag anyway. Let's see how this trainwreck plays out.