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We report the serendipitous discovery of VVV-WIT-12, an unusual variablesource that seems to induce variability in its surrounding nebula. The sourcebelongs to the rare objects that we call WITs (short for What Is This?)discovered within the VISTA Variables in the V\'ia L\'actea (VVV) survey.VVV-WIT-12 was discovered during a pilot search for light echoes from distantSupernovae (SNe) in the Milky Way using the near-IR images of the VVV survey.This source has an extremely red spectral energy distribution, consistent witha very reddened ($A_V \sim 100$ mag) long period variable star ($P\sim1525$days). Furthermore, it is enshrouded in a nebula that changes brightness andcolor with time, apparently in synch with the central source variations. Thenear-IR light curve and complementary follow-up spectroscopy observations areconsistent with a variable Young Stellar Object (YSO) illuminating itssurrounding nebula. In this case the source periodic variation along the cyclesproduces an unprecedented light echo in the different regions of the nebula.

VVV-WIT-12 and its fashionable nebula: a four year long period Young Stellar Object with a light echo?