Boy Meets Maria! https://www.mangago.me/read-manga/boy_meets_maria/
Udagawachou De Mattete Yo. https://www.mangago.me/read-manga/udagawachou_de_mattete_yo/
Shisen no Toriko https://www.mangago.me/read-manga/shisen_no_toriko/
Boys Run the Riot https://www.mangago.me/read-manga/boys_run_the_riot/
these are all great stories that play with gender, though they may not be "gender benders" per se. I'll share more if I can think of them. Enjoy!
MVP!!!!!!! ---> Utsukushii Koto https://www.mangago.me/read-manga/utsukushii_koto_inui_nao/
(I also recommend searching out the lightnovel online to read the story's conclusion- it's worth it)
Kitto Oujisama ga Nante https://www.mangago.me/read-manga/kitto_oujisama_ga_nante/
Okurete kita haru wa https://www.mangago.me/read-manga/okurete_kita_haru_wa/
Because Love Exists! https://www.mangago.me/read-manga/because_love_exists/
Gender bender SL, hope you enjoy! (:
https://www.mangago.me/home/mangalist/1581724/
I have been looking for a gender bender manga or manhwa. Straight or BL.
Or an Omegaverse where they are hiding babies like Dear Benjamin.