Experience: He cum down in my throat 🍆💦
Desperately.
Your boss stopped pretending a while ago. He decided that a beta like you doesn't deserve to have his secret kept safe. So he just printed a pic of him fucking your wife and "accidentaly" posted it in your work chat. Now, he simply calls your wife into his office whenever he likes. She gladly takes his orders and fulfills his every desire just to feel his thick cock throbbing inside her and filling her ferile pussy with cum.
Don't get too distracted, cucky! You have a family to feed and you're running late on all the assignments your boss's given you. Hurry up!
In this case, "probably" means 100% certainty.
Your wife understands you so well -- and has been happy -- indeed enthusiastic -- to make your cuckolding fantasies a reality.