Plapgasms?

Hi yall

Ive bwen trying for a plap gasm in my cage for the last 2 weeks and i alwaya get so fucking close but never actually cum. Its a little annoying as i want to finnally achieve one as i think thier hot. Every time i get super close it falls off and i can bring it back to the edge multiple times but nothing happens untill i remove the top if tbe cage and rub the tip of my clit then i explode.

Any advice would be amazing!

I have a relitively flat cage (the succubus from frrk)