Warui series - Sakuraga Mei

The Student Council has their eye on Towa Aikawa the school delinquent. He hides out on the rooftop, it's his special illegal place. He finds Mikado Shirahane on the roof one day. He's the hottest, smartest guy in school, and now he's in Towa's Xanadu...why would Towa find himself falling for him?

After ups and downs and lots of deep things went between, now the delinquent Towa Aikawa is a very "deeply involved friend" of the Student Council President, Mikado Shirahane. But when Towa visits Mikado's house for the very first time, Mikado's elder brother thought he was Mikado's sex-friend...

Alternate Version
http://mangapark.me/manga/warui-ko-demo-ii

Despite the content of their relationship, the delinquent Towa Aikawa is still a "friend" of the Student Council President, Mikado Shirahane. But today, Towa gets to sleep-in at Mikado's house for the very first time! Could their relationship advance into "lovers" now...!?

Because of some bad luck, Aikawa Towa’s recent problem is the complicated relationship between the devillish student council president, Shirahane Mikado. Kissing is not the only thing… but is this friendship?! What’s more, Towa started to take a part time job to find relief, but… His bad friends, Shinonome and Yukimura saw their kiss scene…?! Eh?! Will two guys be “lovers”…?!

One day during a student interview at school, Mikado reveals the type of person he likes is beautiful. Towa doesn't realize who he is describing and starts doubting their relationship. Later, while on a date with Mikado, Towa shares an intimate moment with Akagi, resulting in a big fight with Mikado. Desperate to make things right, Towa visits the retail booth at school...

Yukimura is the formidable VP of the student body. However, he has a past which he doesn't want to be discovered. The only person who knows about his secret is his childhood friend, Shinonome, the number-one problem student in the school! How far would Yukimura go to silence Shinonome!?

Ever since he had sex with his childhood friend, Shinonome, the uptight Student Body VP, Yukimura, felt he was caught in a whirlwind. He found himself invaded by Shinonome in his own bedroom, in the library,everywhere…! Out of desperation, he found his only defense was to treat Shinonome coldly so he could keep his sanity intact. However, it only pushed Shinonome to go to the extreme…!!

Alternate Version
http://mangapark.me/manga/koi-ja-nai-kedo

Yuki has finally agreed to date Shinonome. But it seems he is having trouble thinking of Shinonome as his boyfriend. Will Shinonome once again be able to win over his lover's stubbornness and become real boyfriends with him?

Shinonome finally made Yuki-chan his boyfriend, but wait... the storm is not over yet. Who's that person who's taking Shinonome away to the counselling room? Is Yuki-chan.... feeling jealous?! And why is Yuki-chan's brother here?

One night after confronting the guy after Shinonome's little sister, Yukimura learns some unsettling news about his boyfriend...