Ab initio MP2/aug'-cc-pVTZ calculations were carried out to investigate HN(CH)SX:OCS potential energy surfaces. Bound equilibrium complexes stabilized by (NC)-C-center dot center dot center dot tetrel bonds and (OS)-S-center dot center dot center dot chalcogen bonds have been found on all HN(CH)SX:OCS surfaces, but HN(CH)SF:OCS is the only bound molecule. Charge-transfer interactions are consistent with the nature of the intermolecular bonds in these complexes. Spin-spin coupling constants (1t)J(N-C) for HN(CH)SF:OCS are consistent with the changing nature of the (NC)-C-center dot center dot center dot bond as the complex passes through the transition state to become a molecule. (1c)J(O-S) describes an intermolecular chalcogen bond in the complex, transition structure, and molecule.