like even if you ignore the whole abuse and manipulation angle, she's literally brainwashed into being his slave and worshiping him, from birth. Her brain is basically hardwired into being his slave. There is no fucking way anyone can possibly rationalize that as healthy.
@kazuma He's explicitly shown to just act bored and ignore it then effortlessly break out of the bondage as soon as his master stops trying to fuck him, it isn't even sadism at that point. Sadism's no fun if the sub basically doesn't even acknowledge anything you do and pretends you don't exist while you attempt to abuse them.
Like shit, I'm into hardcore sadism, I can see the appeal from that angle, I guess - but why try to portray it as healthy or romantic? That's just fucking gross. And incredibly out of character. Maybe I'm just weird, but having porn or ships where the characters involved act massively out of character is just weird to me. Like, I get mad about porn featuring Astolfo in bondage, too, because in Fate that's canonically one of the things he hates and isn't into and thinks is gross.