Here is a link to Adrieli Pinheiro where "she" does a great self suck about half way through the 4 min vid.
http://www.megarotic.com/video/?v=210MF901 She definitely has a monster cock and a monster foreskin to boot. Since this video was done, her boobs have gotten a lot larger and she has even done a video where she self sucks and titty fucks herself at the same time.
I apologize for the link not working, but if you go to the megarotic site, trans catagory, sort by view count, page 50, it is under the title of trans big cock. Hope this works for you.