A little while back when I was going down on my girlfriend I was having a tougher time than usual getting her to orgasm with only my tongue and lips. For 30 minutes I licked, sucked, and slurped. Trying to make her cum, trying every oral movement, or combination of techniques I could think of.
After a while I noticed that her clit was very swollen, so swollen I was able to suck her clit like a penis. Applying sucking with my lips I used my tongue to guide her clit in and out of my lips at a steady rate with lots of suction.
She began to moan very loud as she was about to cum. Suddenly she freezes, her whole body locks up, I quickly used both of my hands to keep her legs spread wide. Suddenly I felt her relax and my mouth began to fill up with a large amount of fluid. I did not hesitate, swallowing every drop and going back for more.