She's bound & gagged & ready for abuse... so what would you like to do to her? That rope between her buns must hurt lot just in & of itself, even before her captor does anything to her. You can clearly see that its cutting in to her, & it can be quite literal "pain in ass." The rest of her bonds look pretty tight & strong, too, however I don not suppose they hurt as badly as rope that traverses her rosebud & bites into it. For few BDSM devotees, its all about hood, rather than paddling or whipping or whatever.