(rare, nonstandard) Belonging to em, gender-neutral third-person singular possessive adjective, equivalent to the singular their and coordinate with his and her.
“You idiot girl! Are you childsick?” She grabbed Asu’s wrist; Asu made no effort to twist away. “Sand and soil, tell me you’re not pregnant. Is it that—what’s eir name? Aeran? Have you lain with em? Tell me!”
[…]
Empre waded out to help them cross the last stretch. More people, a few hundred, perhaps, had gathered along the shore. One of them came running at Melu with a cry—she threw up her arms in defense. But it was Aeran, only Aeran. E seized Asu and clasped her close, eir eyes closed tightly as e sobbed eir relief.