it gently in your mouth. You feel it get harder. You have to let some of it go because it doesn't fit entirely anymore. It takes longer than usual for me to get fully erect because I am still focused on my book, reading. You let your fingers slide over the part that is not in your mouth, your hand closing around my cock, gently stroking at the same pace as your mouth is moving up and down on it.
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Your hand caresses my balls, feel the skin soften even more, my cock still slowly growing harder and harder in your mouth until you know that the only thing that can make it just that little bigger is me cumming. You continue sucking on my cock very gently, making me enjoy it without it being too intrusive on my learning. Every now and then a drop of pre-cum lands on your tongue, you taste the saltines, making you want more.
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You gently massage my balls while your warm soft mouth moisturizes my cock. Your tongue moves constantly over the head of my cock, stimulating it, creating a familiar tingling down my shaft. I read and turn page after page while you pleasure me, loving the feeling of my cock in your mouth, the taste of my pre-cum, sucking out some of the stress of studying.
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After a long time you finally feel the familiar little extra growth, you continue what you are doing, just a bit slower, wanting to make it last as long as possible for both of us. The tip of your tongue pries the little hole as if begging for the things soon to come. You feel the first pulse in my cock and gently suck on, mimicking the rhythm of the pulsing of my cock as it fills your mouth with my cum. because it has taken such a long time for me to orgasm, and also because it had been a while since the last time, you have quite a mouthful.
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Finally you feel the pulsing subside and the squirts come to a stop. You still have my hard cock in your mouth, as well as my cum. I can feel the head of my cock coated in a mixture of your saliva and my sperm, I know you won't swallow it for a while to come. You sit and wait until my cock has softened in your mouth, slowing it down by the minimal sucking you still do and the feeling of your tongue against the sensitive tip. Then you withdraw your mouth from my cock, making sure he is left as clean as you found him.
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Quietly you leave the room again, satisfied and knowing you didn't interrupt my learning. I hear you leave the house a while later, and greet you when you come back in 30 minutes after. You smile and I know you still have my cum in your mouth... 
