Well without any video whatsoever, if it is interracial I can tell you that it is either:
A. Jack Napier from blacks on blondes
B. Flash Brown from interracial pickups
C. Shane Diesel and some unknown BBC from gloryhole
As far as I can remember these are the only big black cocks Stephanie has ever done.
If it's not interracial, she has done quite a few big white cocks, I'll need more info.