I used to take too long during blowjobs, I caused many sore jaws.
I learned about a few things that helped me cum quickly:
- Communication - I guided her to gradually build up the effort, a strong hand grip really helps!
- My imagination - I would come quickly if I thought about an amazing sexual experience or porn scene
- Getting a maximum erection - if the girl held the base on my shaft (clamping with fingertips on the top side) it would help keep me at my hardest and most sensitive.
BJs went from lasting over 20 minutes down to a couple of minutes.