Sometimes it takes time to get a girl to blow you that way YOU like.
You need to teach and train her.
If she is hurting you then she needs to learn how to suck without scratching you with her teeth and/or braces.
Generally, she should start slow and soft, but as you get more and more excited she should be going deeper and faster. Hold her head with both hands and guide her movements until she gets it right. Show her on her finger how to suck something without using her teeth. Meaning suck her finger the way you want your dick sucked, so she gets it.
Also, she should be doing some variations. Sucking it, then taking it out, licking the outside of the shaft, then back in her mouth, moving her head in slow circles and so on. If she's just making the exact same movements at the same speed it will never be as good. Once she has learned to do it exactly the way you like you will be blowing your load pretty fast in her pretty mouth unless you have cum already that day.
Make sure she does this with you standing (or leaning against a wall) and her on her knees looking up at you. That is the correct dominant/submissive position.
Another thing...if you train her real well, you will become more fond of her cause YOU are the one that taught her to give the perfect blowjob.
You need to teach and train her.
If she is hurting you then she needs to learn how to suck without scratching you with her teeth and/or braces.
Generally, she should start slow and soft, but as you get more and more excited she should be going deeper and faster. Hold her head with both hands and guide her movements until she gets it right. Show her on her finger how to suck something without using her teeth. Meaning suck her finger the way you want your dick sucked, so she gets it.
Also, she should be doing some variations. Sucking it, then taking it out, licking the outside of the shaft, then back in her mouth, moving her head in slow circles and so on. If she's just making the exact same movements at the same speed it will never be as good. Once she has learned to do it exactly the way you like you will be blowing your load pretty fast in her pretty mouth unless you have cum already that day.
Make sure she does this with you standing (or leaning against a wall) and her on her knees looking up at you. That is the correct dominant/submissive position.
Another thing...if you train her real well, you will become more fond of her cause YOU are the one that taught her to give the perfect blowjob.