Responses
Here you go,
http://www.mangago.zone/read-manga/watashi_no_kanojo_wa_otokonoko/
http://www.mangago.zone/read-manga/the_story_of_a_girl_who_likes_girls_and_a_girl_who_used_to_be_a_guy/
http://www.mangago.zone/read-manga/is_otoko_demo_onna_demo_nai_sei/
http://www.mangago.zone/read-manga/genderless_danshi_ni_ai_sarete_imasu/ (This may not be what you’re looking for tho)
any manga/manhwa about a relationship involving trans/non binary person? preferably not a straight relationship