http://www.mangago.me/read-manga/nyotaika_yankee_gakuen_ore_no_hajimete_nerawaretemasu/
this manga is similar to this one! except it’s realllyyyy slow, they haven’t actually turned back so far :(
This one is Shounen Ai, it's pretty similar, main character ends up falling in love with his friend, the friend changes into a girl one day out of the blue, and ends up changing back into a guy later.
No matter if the friend is a guy or a girl the main character still loves him. http://www.mangago.me/read-manga/the_boy_with_no_interest_in_love_and_his_genderswapped_best_friend/
Awwwwe... Thankss guuuys!! (▰˘◡˘▰)
I looooveee this kind of mangaa!!! Something like gender bender... YEEEEEEEEEEESH!! Recommendation? Anyoneeee!? ヾ(❀╹◡╹)ﾉ~