the mirror was what sekhmet used to make horus lose his sanity/mind. he had no power over what he was doing at all, so he didn't know about what's being done to him either. since he was being controlled the whole time, he didn't have sex out of his own will. he was forced.
horus kind of got raped too...
like, he literally had sex against his own will....
i feel so bad for the both of them. esp horus who probably won't even be able to comprehend what he'd done once he's in his right state of mind.
and seth. mannnn, it's like the world against him at this point. he doesn't deserve any of this.