Crazy reaction

I was giving my bf head well ex bf now its been a year but i was giving head and all of a sudeen he started shaking n laughing im like what he told me to stop i asked why he was like it feel to good i like the shaky reaction so i kept doing it n he wanted to cum but he couldnt it was halirous but i wanna do tht for my bf now but hes a lil bit lets say havent hit puberty he small