Yes! The insemination should begin with a firm cum-thrust. Then allow your cock, balls, ass, thighs and hips to shudder and shake as the seed goes into her. Stay coupled - kissing and cuddling - after you finish twitching, while your sperm does its primal task in her womb.
45EE-36-47, 48 year old wife did this with a stranger while at a business conference. 9 months later she had a special delivery at our local hospital's maternity ward. She always wanted a stranger's baby, now her desire is fulfilled! Good time by all!!
I have to say you are dedicated to your art! I wouldn't want to pull out and get off her... I'd want to plant myself deep and just stay in deep as my cock empties and stay in as it slowly shrinks and slips out on its own!