  The result of a numerical simulation of two interacting particles in the
framework of Nonunitary Newtonian Gravity is presented here. Particles are held
close together by a 3-d harmonic trap and interact with each other via an
`electrical' delta-like potential and via the ordinary Newtonian term, together
with a fluctuational nonunitary counterpart of the latter. Fundamental
nonunitarity can be seen as arising from the interaction of the physical
degrees of freedom with (gravitational) hidden copies of them. Starting from an
energy eigenstate within the ordinary setting, it is shown that, while energy
expectation remains constant, a slow net variation of the von Neumann entropy
for the system as a whole takes place, with a small modulation induced on the
relative entanglement entropy of the two particles. Besides, the simulation
shows explicitly how fundamental gravity-induced entropy can be clearly
distinguished from the subjective notion of coarse-grained entropy, i.e. from
the entropy of one particle with respect to the `environment' of the other.
