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I'm sorry but apparently Everyone is deaf in bl's? Because they be doing it everywhere in public and not be getting caught.
Please there's a high chance some mob characters probably hear it but just keep quiet- I think you'll like reading this:
http://www.mangago.zone/read-manga/zettai_bl_ni_naru_sekai_vs_zettai_bl_ni_naritakunai_otoko/
Rest and peace Mika