Sebastian's rhymes with:
bastions, bastions, bastions, christians, question's, questions, questions', suggestions, abstentions, appalachians, bastions, christians, fortune's, fortunes, hitchens, houtchens, hutchens, intentions, interventions, kitchen's, kitchens, luncheons, mansions, misfortunes, question's, questions, questions', suggestions, tensions, urchins
Sebastian's sounds like:
scapegoating, sebastianis, subjecting, subsidence, subsiding, subsistence, substance, substances, substituting, substitutions, subsystems, suffocating, suppositions, suspecting