I have this fantasy that i have sex with my wife and cum inside of her and then she has me go down on her. I told her about it last week and she said we should try it. so last night i completed the first 1/2 of the act and then when i went to go down on her i lost all interest in doing it. Has anyone ever had this similiar thought and then changed their mind? Or any other fantasy that wasnt as good as you thought it was going to be when you went through with it.