  We discuss the optical light curves of two Be X-ray Binaries, IGR J06074+2205
and SAX J2103.5+4545 recovered from the ATLAS, ZTF and ASAS-SN databases. Both
sources show long term optical variability of 620 and 420 days respectively,
with color redder when brighter. We suggest that this is due to the precession
of the circumstellar disk. Another possibility is the propagation of a density
wave in the disk. We remark that only these two sources show a large amplitude,
periodic optical variability out of a sample of 16 well studied High Mass X-ray
Binaries (HMXB) with a Main Sequence primary star.
