  We investigate transition form factors between non-relativistic QCD bound
states at large recoil energy. Assuming the decaying quark to be much heavier
than its decay product, the relativistic dynamics can be treated according to
the factorization formula for heavy-to-light form factors obtained from the
heavy-quark expansion in QCD. The non-relativistic expansion determines the
bound-state wave functions to be Coulomb-like. As a consequence, one can
explicitly calculate the so-called ``soft-overlap'' contribution to the
transition form factor.
