wow!! the way she made him squirt I’m surprised he didn’t scream out!!
The key here is to stretch the skin of the penis a comfortable amount as you stroke him. If you pull too far down, you’ll put strain on the skin directly beneath his glans (head of the penis) which hurts and will make him go soft. If you go too high, you knock against his glans which is more sensitive and needs to be handled like a baby’s head when your hand is concerned.