it's a double reason: pain and slight mind control

You watch the porn, but your cock hurts too bad and try to look aside, just for your look getting attracted back to the screen. Either ways the sound is already too bad and gets you aoused itself.
Your cock aches too bad and you can't sleep in whole the night, with more and more porn getting exposed in front of you. First is only the usual porn, but at the end it also includes a subbie guy getting sumitted to a couple

upstair your wife and her lover are talking
"Don't worry the messages i included in the porn are making sure by tomorrow he'll know how to please your cock properly. He'll still hate it horribly, but he'll know how to do it