Just Made a new Fanfic, if you love the terror twins check it out. Though fair warning, my writing isnt the best but hey its all about having fun while doing it. XP
How about she hears that there’s a witch who can remove a yokais mates markings. But it comes at a great price?
Or
Have where sesshomaru can actually mark her as his mate making the other one void/null? Or maybe that when she fell out of love the mark bleeds and would end up fading unless the other yokai that marked her as his/her mate redoes it?
(Sorry if my explanations aren’t the best. I’m horrible at explaining things but I hope you can get some idea what I’m talking about.)