Lucifer let the rings choose which would go to Jon, because those feelings are in all of us and they work best when the emotion is already the dominant one so the yellow (pride) ring was chosen and placed on Jons finger.
He smirked "The sin of pride" The devil whispered "is what will do you in" and with that he was off to make some more preparations. In Zoë's room he put the purple ring on Zoës finger, and removed the stairs so Jon would have trouble the next day. Then it transferred to Karyn's room and gave her a massive cock.
"One more thing to do" and with that it was morning with Jon only getting a few houres of sleep.