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Don't write it in. What readers do in their own fan responses is on them, not on you, and you can't prevent people from shipping anyone they like. But if you don't want canonical romance, just......
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/42387 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/42387 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Don't write it in. What readers do in their own fan responses is on them, not on you, and you can't prevent people from shipping anyone they like. But if you don't want _canonical_ romance, just... don't put it in. Make sure your narrative voice doesn't talk about Kem in a way which could be interpreted as romantic or sexually attractive. Don't have romantic plots or interactions. Don't have characters attracted to Kem. If Kem is aromantic and asexual, they could even lampshade it by discussing it with the other characters.