My Son has to be seated when I blow him so he doesn't drop to his knees when I get him to cum for me. I usually have him sit on a stool in the closet, one of the toilet seats, or if we are home alone, on the stairs to my bedroom for our blowjob sessions. Also, I have found I can get my Son to cum a lot harder for me if I pull his scrotum forward when I get him to go high order for his DOM (Dear old Mother.) Two or three times a day usually does the trick during the school/work week, but on the weekends is when I tend spoil him much more ;)