I'm writing this story, and I'm having the damndest time transitioning from buildup to action. It feels clunky and rushed or way too long winded and a bit boring, and there isnt much flow to it. I've deleted and rewritten it a few times already, but I'll never post it if I dont settle on something soon.
write the buildup, write the action, write whatever you feel comes after that
then circle back, read it, see what works and see if you can cleanly get from one segment to another. That may show you where the problems are.
I've done half of the story I'm currently writing. I'm pretty sure I'll need to revisit the first half because there's not enough erotic energy to necessarily keep the reader going for the next five hundred words.
I'm having the same problem you have in transitioning from buildup to action, in the second half of my story. But while I was driving the car this afternoon, I came up with an idea that makes the transition organic. And also lets me add some depth to one of the characters, which I think is an issue with the first half anyway. I may put some words down in that direction later tonight.