Lie

If you outright lie to your mother, she will be able to spot it right away, so you decide to go with a statement that is the truth but doesn't tell the whole truth. You slowly shake your head in the negative "Mom, what I said was the truth; your king requires much more experience in the matters of the fairer sex." As you help her to her feet. "Now I believe you have a fenicy who is patiently waiting for you. Someone that I think you are going to have much to explain to. I think it would be much too rude for us to make him wait any longer."

She looks you in the eyes with questioning looks as if she doesn't know if she should fully believe what you said before gently placing her hand in yours and saying, "That is true, my King." After which, you guide her out of the chambers and to her fancy waiting carriage. The carriage couldn't depart fast enough for, after the sight you saw, you had a problem in your pants that needed to be tended to, post haste. That problem is a raging hard-on.