anyone

I picked them based on my personal taste and they are good IMHO, but I don't know if you'll like them as well (￣∇￣")
http://www.mangago.me/read-manga/j_no_subete/ this is one of my faves
http://www.mangago.me/read-manga/udagawachou_de_mattete_yo/
http://www.mangago.me/read-manga/nise_x_koi_boyfriend/
http://www.mangago.me/read-manga/kizudarake_no_airabuyuu/ the stories are connected (about two brothers, but there're some disconnected one shots as well, the gender bender part is later in the story, so Idk if you'd want to read it)
http://www.mangago.me/read-manga/hanayome_wa_juunanasai/ (it's not a bad one, still ongoing and kinda funny)

if it has gender bender Ill love them lol