I loved this so much!
Your writing style was great, and there were a few choice phrases that I absolutely adored: "Draco's hand making mischief at the junction of his thighs", "The hands were no more idle." were my two favorites, and really stuck out to me. Of all the ways to segway from one movemnt to another in a scene, 'The hands were no more idle' is damn near poetry, I'd say. I've been working on my own fics, and OC's but have felt they've been missing something recently, and this made me realize, that I've been leaving out the artistry in trying to just get it written. Your details are perfectly descriptive, while not going overboard to unbearably vulgar. A very tasteful fanfic, and wonderful reading experience.
I've never actually read a Ron/Draco fic before, but this one has created a sudden need in me for more of this pairing.
" It was a cycle that continued until the shag reached a screaming, groaning, messy crescendo and Ron fell breathless beside Draco on the mattress." This was also a piece that was noteworthy, in two ways. I feel like this accurately describes sex, while still maintining the elegance of your writing style. It brings the sex scene to a fast close, but adeptly portrays the sometimes hastened, and senseless experience of orgasm.
10/10 story, no real criticisms from me.