Maybe it was the angle.  Maybe it was the speed.  Or maybe it was just that Lafiel was really, really horny.  But whatever it was, when she came down this time, sparks flew through her brain, and she orgasmed.  What was important - she kept going, and with each new downstroke, she got another orgasm.  It was stroke five after the first one that she finally gave out and collapsed on top of Kanae, the ripples of half a dozen orgasms having reduced her mind to temporary mush.