Assisting step-son before his interview

I walk in and step-son looks worried and tense before his interview, i ask him if he's relieved himself as it helps reduce stress. he hasn't and i encourage him to do it, he starts slowly wanking. but he needs step-mommy's help to make sure he blows a big load so i start wanking him to his surprise. things progress and i move on to sucking and then riding his dick, begging him to cum inside me.