I have never gone numb in the mouth but I generally always make my guy cum if I'm giving him a BJ... we don't usually have marathon BJ's though, 1 hour is ages...maybe we could give that a go but my SO gets a bit desensitized if we go for too long. Well, I guess I'm lucky, either I really get him off well, or he just cums quickly 
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Whether we write or speak or do but look
We are ever unapparent. What we are
Cannot be transfused into word or book.
Our soul from us is infinitely far.
However much we give our thoughts the will
To be our soul and gesture it abroad,
Our hearts are incommunicable still.
In what we show ourselves we are ignored.
The abyss from soul to soul cannot be bridged
By any skill of thought or trick of seeming.
Unto our very selves we are abridged
When we would utter to our thought our being.
We are our dreams of ourselves, souls by gleams,
And each to each other dreams of others' dreams.
Fernando Pessoa, 1918
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