Advice on situation with my son.

My son lives on his own with his fiancé. They are set to be married February 2nd. During my son’s high school years we had a unusual close relationship that developed his junior/senior year. Long story shortThere was a couple times that I gave my son a blowjob. That’s all that happened. We never had full on sex or anything. It only happened a handful of times his junior and senior year. Now that he is getting married he wants to come clean to his fiancé that this happened. Am I in the wrong for freaking out and telling him that is not a good idea at all. I understand wanting to start a marriage with no secrets. But this secret is your own mom giving you blowjobs before. I just don’t see how anything good will come out of it. What y’all think?

This is a real situation. Ask more details if you need more confirmation. Also have a old Polaroid pic of my sons cock in my mouth for proof. Thanks yall