Interesting regarding your W trying to get you to bite. At what point would you bite Rysin? If she tried to initiate sex for example, what would you do? Cave in in hope it was the start of reconciliation or enforce a boundary that you wouldn't have sex with your W if OM still in the picture?
You never know, this may be something you have to deal with...so maybe it's best to give it and other similar situations a think.