It's surprisingly effective

Since this day he doesn't try to convince you to let him cum early. He withstands all the edging you tell him to do, even if it means that he will suffer much more than during this first day. Two times you try to have sex with him, but he cums too early. But you see some improvement. Today you plan to make the third attempt. You enter his room and sit on his bed. He looks at you, full of hope. You sit on his knees and plant a kiss on his lips. He quickly reciprocates, his hands are squeezing your ass. He's much more confident than in the beginning. He takes control and begins to undress you, you allow him. He's gentle, but quite decisive in his moves. When your bra if lying on the floor he takes your breasts in his hands and begins to massage them. Then he takes your nipples between his lips and suck on them. It's pleasurable. His lips travel to your pussy. He's going down on you. By now he knows what you like and he's giving you exactly that. And he gets clever, he gives you pleasure, but he doesn't go all the way, he doesn't make you cum. So you are horny and it will be easier for you to orgasm during fucking. You give his cock a few strokes and then push him on his back.

You get on top of him and begin to ride him. Jack let's you take the initiative, his hands are groping your breasts.

"Oh fuck!" you moan. He did pretty good job licking your pussy. You go up and, up and down, faster and faster. He still didn't cum, that's a great news.

"Emily" he says "I think I'm gonna..."

But you don't hear him, because you are feeling incoming ecstasy, you are chasing your orgasm. You see on his face that he's struggling, but it's too late to slow down, you even speed up your movements. And then it happens, almost in the same second. His penis twitches and spill its seed inside of you and you feel spasm of your pussy and cum loudly. You hold Jack tight, your nails scratch his skin.

"Oh god, oh god, oh god" you had more intense orgasms in your life, but this one is special. It was given to you by your brother, with his cock.

"I hope I won't get pregnant" you joke and then kiss him.