you should read the younger brother (mikado x towa) story first then you will understand their hardship to getting together...but if you don't want..you can just read their story
mikado story: http://www.mangago.zone/read-manga/i_want_to_be_naughty/
aikawa x shirihane:
http://www.mangago.zone/read-manga/mujihi_na_otoko/
Here's the order of the stories... Enjoy!!! :)
List of Warui Series:
Vol 1 Warui Koto Shitai [1-1]
Vol 2 Waruiko Demo Ii? [1-2]
Vol 3 Kirai ja nai Kedo [2-1]
Vol 4 Koi Ja nai Kedo [2-2]
--- Warui Koto Bakkashite Gomennasai [1-3 & 2-3]
Vol 5 Warui Yatsu Demo Ii [1-4]
Vol 6 Mujihi na Otoko [3-1]
Vol 7 Warui Koibito ja Dame? [1-5]
Vol 8 Kare ja nai kedo [2-4]
--- Warui ko Tachi no Bansan [1-6 & 2-5]
Vol 9 Mujihi na Anata [3-2]
Vol 10 Sunao ja nai Kedo [2-6]
Vol 11 Warui Ouji Demo Suki [1-7]
Vol 12 Mujihi na Karada [3-3]
Vol 13 Shouwaru Ookami ga Koi wo Shita Rashii
Vol 14 Himitsu Ja Nai Kedo
Here's a list I made (⌒▽⌒)
http://www.mangago.zone/home/mangalist/23316/?filter=&page=1
What order do I read this in?