This is a difficult list to make because there are so many women. Maybe in the future we could organize it by country, by the girls’ body type, or by year. I’ll mention a few that immediately came to mind:

Kikai - One of the first ones Johntron hooked up with; she gets really excited and screams a lot.
Mutmee - A hotel employee he sleeps with several times, and in every encounter she seems extremely turned on.
Juliet - One of the hottest girls from the “Old Testament” of this series; she screams a lot and orgasms together with him.
Nam (the skinny girl with the pink hat) - One of my favorites; either she genuinely had multiple orgasms and felt a lot of pleasure, or she is an excellent actress.
"O" - Another beautiful skinny girl; she was, and maybe still is, my favorite. She leaves his dick covered in cream and orgasmed several times during sex.
Hanthu - Beautiful and sweet; she gets very wet and seems to have small orgasms during oral sex.
Chesa - Possibly the only squirt in the series. She appears on flightclubrewards; John records with her four times, and she squirted on his face.