"you_gonna_get_raped" isn't actually about the physical act of rape. It just means something bad is about to happen.
For someone who is literally about to be rape then that would have the tag "about_to_be_raped".
As for Reisen, I do believe she's in for "a thousand years of pain".
Well Sakuya may be a killer ( it's somewhat implied she kills humans for Remilia) but she won't go as far raping her victims , after all she's class . Still Udon got what she deserved.
Well, well, haven't we done something really bad, just now?*swing**swing*You Udon-bastard.