Well, he made you cum

"I don't know" you say teasingly "you are learning to please the women..."

"But Emily" he whines "you promised..."

"I said" you enjoy playing with him "that maybe I'll return the favor. That wasn't definitive" he looks at you pleadingly, he looks almost adorable now "oh ok."

You get down on your knees and unbuckle his belt. Fuck! You of course already knew that he is big, but it still amazes you. No way you'll take him fully into your mouth, but considering his experience you doubt that it will be necessary to make him cum. You start with your hands, you give his cock a few strokes and then lick the head of his cock. It twitches as soon as your tongue touches it. You drive your tongue through the whole length of it and quite quickly you get the expected effect - first traces of precum appear. So fast. Too fast. Well, he is inexperienced. But you are not in the rush, so instead of immediately taking him into your mouth, you continue to toy with his cock. And you don't stop to play even later when you finally start sucking. You want to increase his stamina, so you bring him to the edge and then...stop. He moans and begs, but you have a heart made of stone and you keep denying his orgasm. But he doesn't have a patience of Tibetan monk and when you try to do the same trick again, his hand forces your head deep on his cock and with a loud moan he fills your mouth. You cough and most of his seed lands on your knees and on the floor.

"Jack? What the fuck?" you are angry.

"Sorry, sis" he blushes, ashamed "it's just you were constantly stopping and I needed..."

"We are trying to teach you some self-control! Fuck!" you try to get his cum out of your body and clothes "you'll clean this off" he nods immediately "next time we'll tie your hands behind your back" you promise.

"So there will be next time?"

"Maybe. But you have to be a good and quick learner" after saying this you leave the room room trying to hide your smile.