8-O *drool, drip, throb*
It’s a race. The first to cum stays where it is. The second gets to please.
Male and Female
Design and Technology classes at Denial Academy were one of the student favourites. The annual Fucking Machine wars competition pitted girls against each other, those enduring their opponents’ machine’s ministrations the longest would proceed to the next round.
Of course every machine had a failsafe, the moment an orgasm began all stimulation would cease, ensuring a ruined orgasm.
The prize - the winning designer would be allowed to take her machine to assembly and ride it all the way to full orgasm in front of the whole school.

Getting a girl to crave anal is really quite simple.
Make her edge all week, then cum like this on Sundays.
Shouldn’t take more than a couple of months.
Couple of weeks in my experience, if the edging is all done to anal porn.