Torn between humiliation and supreme pleasure. It's not even physical. She just loves to see him happy so much, she loves knowing he's pleasuring himself in her ass. It's even better than she feels used and degraded.
[F24 / 5'2" / 150 lbs] Long story short, went to bar, guy striking out with friend said outloud how her tits are so much bigger than mine and how I'm just jealous bc I'm flat (she was drunk and pushing him away so I intervened)
Your wife is pretty much just a sex object for your bully. Nothing but a toy for him. So why would he share his sex object with you? Isn't it only reasonable you never get to see her naked again? He owns her tits, not you.