How about a game?

"How about a game?" The two looked up hopefully.

What was I talking about? That was my girlfriend. Why did I find all this so arousing?

"Jennifer will soon get down on her knees. Whoever of you that takes longer to cum on her tits has to lick up the mess. Of course we'll wait until the loser has cum, too. I'm not a monster."

I wasn't so sure about that anymore. But my resistance dropped. The desire slowly won.

"The winner gets to remember our conversation and the things we will have done with Jennifer. The loser will forget everything.
Good luck next time.

However, if you both refuse, I'll make you both forget all the beautiful things we've experienced in the past few minutes and sit at the kitchen table with your hard cocks in amazement and play cards. I'll have to think hard about whether there will be another opportunity to play with Jennifer.

So who's joining?"

The boys thought briefly about what was said and the possible consequences and looked at each other uncertainly. Then they both nodded.

"Very nice. Jennifer, get on your knees and show off your great tits."

Jennifer knelt in front of the two boys, put her arms under her breasts, and lifted them up. John and Ben stood there with their mouths open.

"So come on, guys. Today, for once, the one who cums faster has the advantage. Pants down!"

John and Ben dropped their pants and shorts to their ankles.

What a sight. My girlfriend knelt there, dressed only in her thong, in front of her little brother and his best friend and presented her tits to them. The two boys were standing directly in front of her and now came a whole lot closer. Their hard cocks rose right in front of Jennifer, who listened, oblivious to the music. John's penis was a bit longer than his friend's, but Ben's cock was a lot thicker.

"Here we go!" I said, yielding to the stone's call.

The two started rubbing their cocks. Neither of them wanted to be the last. Then I had an idea.

"Jennifer, cheer on your brother and his friend to cum on your tits. Show them how hot you are for their cum."
"Please, guys..." Jennifer moaned. "Please jerk off on my great big tits."
"John!", she said, looking him straight in the eyes, "You always undressed me with your eyes. Show me what your hard cock can do! I need you!"
"Ben...", now she looked at her brother, "Please give me your seed. Just spray it on my tits. I want to feel my brother's cum on me!"

She looked pleadingly at the two friends, bit her lower lip, and squeezed her tits a little more.

The two friends rubbed their cocks, their heads red. Nobody wanted to lose. They kept looking back and forth between Jennifer's big breasts and her beautiful face.