1.) This was a Cinderella-esque story featuring Jazz as the leading lady (mech), Prowl as the Prince, and Tracks(?) as one of the possible evil siblings if not the stepmother. Ironhide and Chromia were two of the servants in the household and it appears that the former had been sold by the stepmother and Jazz was able to get him back through some means. The king(?) may have been Smokescreen, though I'm not too sure on that. It also had Blaster as one of Jazz's close friends, a moment where Jazz thought that Prowl was a common thief and possibly whacking him with a broom, a crystal visor that Jazz's late creators had possibly been saving for him (which he finally snapped over when his siblings tried to take it), and mention of him sporting striping that was indicative of being apart of the royal family once he and Prowl hook up.
I do know that it had several chapters (between 7-15) and is a few years old, so that may help a bit.
2.) This one I had found early into my time as a TF fan, so a few details may be wrong due to a hazy memory. This one had Prowl as a slave that was being bought by an adamant Jazz (who seemed to be a well-known lord??). He seemed to be worried about what would happen to him, and there was some mention of him being assaulted by the guards(?) if I'm right. It possibly only had one chapter, and may be either in-progress or complete label-wise. I've been worried that it was deleted in the Purge on FF.net, so if you could at very least give me the name of a possible author you'd have my eternal gratitude. :)
Sorry for how choppy this may read as. I'm a bit anxious to find these two, so a bit of it may be bleeding into this post. ^ ^;