For goodness sakes tell the OM's W what's going on. She is NOT going to be happy your W is getting 'mind blowing' sex from her husband.
There is no way he is going to choose your W over his own. Get a back bone and deal with it. If your W wants full honesty then she needs to makes sure OM's W knows what's going on......and I bet she is not ready for that amount of honesty.
OK....things may go pear shaped for a while but at least the lying will stop and you just may have a chance at working on your M. At the moment you are just getting walked all over.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength