Hirs

Tom wanted to switch her gender with Mary's, but Mary wanted hirs to remain neutral.

S/he leaned forward and, to Selar's surprise, took the doctor's hand firmly between hirs.

She saw that Burgoyne was hefting hirs experimentally, sweeping it through the air. S/he twirled it around a few times, swung it back and forth.

Ze takes my right hand in hirs and folds it into a fist.