for me (unless I'm missing something, again!), even though I can grasp no ''real'' story in your poem it does have a pleasant fairytale ambiguity about it that makes for an enjoyable read.
However, I do have a couple of questions and a pointer.
Qs: Why is back-alley hyphenated? Would it not read better with a comma after Boys (..in a back alley, those Friday Night Boys, her wings …)? Should there be some punctuation here (Before she turned to snowfall she turned her eyes to mine meeting my stare with twinned blue iris.)? If she turned her eyes, why ''iris'' singular?
Pointer: You use ''like'' on three occasions - not only does this stick out as being repetitious, but ''like'' is a word that tells you very little. It (like) should therefore be used sparingly – like every once in a while, but like not like all the time, like. One of your likes could be easily dealt with (they were different like she was different - they were as different as she was different.).
I actually think your poem reads better as prose – however, this could, in all probability, be down to my preference for prose over poetry.
They left her in a back alley, those Friday Night Boys, her wings whipped and cracked into mad angles, flight feathers stuffed cruelly into her mouth. Her throat pulsed in spastic convulsions, windpipe sobbing and bleating like a broken heart. Before she turned to snowfall she turned her eyes to mine, meeting my stare with twinned blue irises. I had never seen eyes in flower before. They were as different as she was different. It was this difference that the Friday Night Boys craved.
To be continued...?
All the best,
Writing for an audience of one.