I think he could do it because basically the first orgasm was kinda ruined, with her stopping touching him right after the point of no return. It was only the second time, when she kept stroking him to the end, that he had the full, satisfying orgasm he's been craving.
Kinda' amazing the way she lightly tickles his scrotum to induce his initial pre-ejaculate at 4:29 then there's quite a delay before he finally squirts out his pregnancy-inducing semen 4:55 that was meant to make her have a baby whether she wants to or not