Fire up your foreplay

Don't be too gentle when you're giving him a helping hand. Although you must never bend an erect penis (it can break), you do need to apply a fair amount of force when masturbating him - particularly when he's about to come. If you're still in doubt, try masturbating in front of each other - you'll both be turned on and will get to see how it's done.
Men do love the sensation of their penis deep inside your throat. Why? Because there are so many more nerve endings at the penis tip and, when it rubs on the back of your throat, it feels great. So, to get more of him inside you, try doing it with him standing and you kneeling so your chin is raised, elongating your throat.