No, you ask Diana to keep going.

"Actually, Diana," you say, "That felt amazing. Would you be willing to keep going?"

Diana looks up at you, exasperated. "Joe, I really do want you to enjoy this, but ultimately it's not for you, it's for the girls. I want to get Sophie comfortable giving oral sex, I'm not just trying to get you off."

"But I'm really REALLY turned on," you complain.

Your friend looks at you with some concern. "Is it uncomfortable?" She asks.

"...yes?"

She nods seriously, "I'm sorry, I didn't think about what it might feel like for you to be aroused this long without having any kind of release. Girls- sometimes when a man gets very stimulated with ejaculating it can become uncomfortable, almost painful. Women can also feel frustrated, but it doesn't usually hurt."

"Thanks for understanding," you say.

"Absolutely," Diana responds, "I really appreciate you coming to help us out, and I'm sorry to put you through all this. Obviously, if you want to leave now and go 'take care' of yourself, that's totally ok. But...if you felt comfortable masturbating in front of the students...to completion? That would be really educational for them."

"Oh!" You respond, surprised, "I thought you were going to suck me off."

"Why would I do that?" Diana looks confused, "you volunteered to model for the girls, but me continuing to give you oral sex doesn't educate them any further. They've already seen me do that. I thought you needed relief for your comfort."

"I do!" You exclaim, "It would just feel even better if you did it. It's not the same when it's just me."

Diana puts her hands out in exasperation. "Joe, does masturbating keep you from getting blue balls?"

"...yeah, of course."

"Are blue balls stopping you from being able to comfortably be a model in this class?"

"Yes, that's what I said!"

"Then masturbate and take care of yourself! You don't need me for that!"

"I know, but it would feel even better--"

"Joe, no offense, but I'm not here to give you pleasure, I'm here to teach a class. Now, I don't want you helping if it's going be hurting you, so you should go masturbate. Or masturbate here and show the girls what that looks like. But please stop asking me to get you off."

Something in the tone of her voice makes you stop arguing. You can't help feeling confused as to why the woman who was sucking your cock just moments ago is now refusing to suck it further.

Also, the whole conversation was just a huge mood killer. Your rock-hard erection has dropped into a floppy Freddy, still moist with pre-cum and Diana's saliva.

Well, what are you supposed to do now?