the one who managed to make me finish was quite the slut...

uhm, well it depends on the person and your preferences , suction helps alot for me though, not being too hard on the tip as it's more sensitive obviously, get her to use her hands too and use the spit as lube ( either that or get some nice tasting lube to help out ) sometimes speed helps too, if she can narrow down the best thing to do at the tip of your shaft involving the head im sure you'd fill her gob right up