Cum Jackpot!
That means "later" is NOW !
Add 30 to your metronome speed and double the stroking time to 200 seconds.
Sounds easy heh?
The catch?
There are 2 girls ! That means 2 edges. With 30 second break between them (can't hold your cock in that 30 seconds).
5% extra cum chance if you accomplish that.
-15% if you fail.