Straight manhuas where the FL is pretending to be a man?
Lol straight up ouran hshc
If you are ok with historical : https://www.mangago.zone/read-manga/the_reason_why_the_twin_lady_crossdresses_little_cacti_scans_ver/ https://www.mangago.zone/read-manga/seabird_and_the_wolf/ https://www.mangago.zone/read-manga/aristit_was_blessed_with_a_curse/
https://www.mangago.zone/read-manga/queen_cecia_s_shorts/
Straight manhuas where the FL is pretending to be a man?