As you probably already know, this was a wonderful look at Lucius' desires.
Good job with the re-write in paragraph one. That is much more clear now.
I really liked some of your word phrasing, like what he could do with that cock, with what such a cock could do to him and He resisted until he did not and as a gentleman should but not as a gentleman would. That's the kind of repetition that makes an impact. Nicely done!