Well i don't think that it would be a stretch to say that of all the personalities Hibiki is the one that cares about Kosukegawa the most, so i'm sure that helped immensely to him not getting wasted on the very first blow

If you think about it the way she still sodomized his ass even while fused with Hibiki is more of a testament to just how brutal Zero really is

And i think the way he just kinda brushed that shit off with a resounding "whatever bitch, i'm moving on" was way cooler than anything i expected him to say