Convince the coach this is normal and then start the 'climax test'

“Calm down” you say to the coach “What is going on here is perfectly normal. You know that. I as a doctor and you as their coach are supervising the girls are examining each other’s bodies for anomalies, just like we always do. I know it really turns you on but it’s a health requirement of the school.”

“Oh yes!” she says, becoming flushed as she watches “I forgot that was today. Would you mind doing this alone?”

“You know I can’t” you say “There needs to be a female member of staff here to ensure I don’t do anything untoward to the girls”

“I know but …”

“Don’t worry” you say “I’ll help you relieve your discomfort, just like I always do. I know how much you enjoy the feel of me inside you. How you orgasm so much harder and longer when your with me.”

She goes quiet and you see a look of arousal and anticipation on her face.

“Now” you say to the girls “We are going to do the climax test. Your coach will come around to each pair and hand you a stopwatch, then one of the pair will stimulate her partner’s clitoris and vagina, using her hands and mouth, until sexual climax and time how long that takes. This is not a race! You must be honest about how long it takes you to reach climax. I know that you all enjoy making the other girls climax, but you need to allow your partners to measure your orgasm speed as well. Alright Coach, if you wouldn’t mind …”

The coach hurries off and returns with seven stop-watches and hands one to each pair. By the time she has returned to you the girls are already working on each other’s pussies and the sounds of slurping and moaning are filling the room.

“O.k.” you say “I think it’s time I tested your orgasm speed, don’t you?”

“Yes” she says smiling and beginning to remove her clothes.