My g/f needs lessons on sucking dick does ne one have suggestions to make her better

My g/f loves to suck my dick and she badly for me to cum in her
down her throat. The problem is that she can't make me cum
bcause she isn't good. Sometimes will suck my dick for over
an hour trying to get me to cum and it just doesn't work. I want
to be having sex but most of the time we don't even get that
far because she won't stop until her jaws begin to crack and
by that time the mood is definitely killed. Can someone
please help me out with somethings that she could do.

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