ok this isnt about game really much at all. its all about how to turn her on and get her wanting it more and more. usually what works is like biting in sensual places like neck, collar, gently nibbling her lips when you guys kiss. and then the death is in the details of foreplay. a proper fingering session will get thru any girls LMR just because they want it so bad. ok so if you dont know how to give a girl a g spot orgasm by fingering, your way behind. but the g spot is about 2 inches inside her up towards her stomach. you will fill the difference between the walls of her vagina and her g spot. while fingering her you want to play with her g spot, first a little gently and then getting rougher and rougher. but if ur fingering her and dont want LMR, you need to NOT let her cum, if she says she going to cum, tease her and stop.
to make it fun you can make it like she is trying to win over you and trying to get you to sleep with her if you play the part right. where you just keep teasing her and need to stay in control.
but the jist of it is turning her on until she just wants you more than anything. good fingering is probably the best weapon you got. so not only working her g spot, but gently massaging her clit is wonderful for her also. the clit is a little above the opening of the vagina and is definitely seen easily. im sure u know, but if you GENTLY massage it doing like circles and then also working her g spot, i can pretty much guarantee that LMR is only lasting another five minutes max. try turning her on more and definitely be a lot smoother with your movements, you dont want to look like ur a complete newbie at sex, at least show her you have some experience!
good luck, sorry for a little tough love. you just need to know how to turn her on