Frustrating for Robin, Enjoyable for Dr. Clay

"Are you sure? Right here?" Robin asked.

"Of course, our therapy sessions are primarily concerned with your sexuality, so it's perfectly normal to perform some sexual acts during our sessions. Of course, that doesn't stop it from feeling humiliating and degrading for you. We're both just lucky that being humiliated and degraded is such a turn on for you."

"Okay, I suppose you're right," Robin said. He blushed deeply as he pulled down his panties, exposing an already hardening cock.

Robin's dick was perfectly respectable, above average length and quite thick. It looked quite big on his small, skinny frame. But, of course, it wouldn't do to for him to know that.

"Good thing you're a sissy," Dr. Clay said, "that little boy-clit could never please a woman."

Robin blushed deeper in shame over what he now perceived to be his inadequacy, but the humiliation make his dick twitch in arousal.

"Now go ahead and show me how you edge yourself."

Robin spit on his hand and started stroking, slow at first and then faster. The contrast between Robin beating his big dick while wearing a bra and biting his feminine lipstick-covered bottom lip was quite amusing. Dr. Clay took out his phone and started filming.

"Carry on," he said, "I'm just documenting this for future records."

Robin started to grunt and moan in pleasure, and Dr. Clay could see he was about to cum when Robin suddenly let go. His dick danced and bobbed and he let out a groan of frustration.

"That's not close enough to the edge, I'm afraid," Dr. Clay said. "Keep stroking, but don't cum."

"I...I don't think I can," Robin said, "I'm so close."

"You can if you really concentrate," Dr. Clay said. "Just fifteen more strokes."

Robin did as he was told, stroking exacty fifteen more times, sweat beading on his forehead. This time, when he stopped, a bead of cum slowly leaked out after.

"Much better. Now that's edging," Dr. Clay said. "From now on, this is how close to the edge I want you to go every time."

"Aaah," he said, "that's so frustrating! I need to cum so bad!"

"Well, the problem is obvious. You're still masturbating like a boy. You need to start masturbating like a girl when you edge yourself."