Well, I just read some of mentaiko's work, and i've fallen in love with it(Priapus<3)! :3. But what I'm looking for is something like his "Ookami Shounen to Hamu no Hito" ... I can't seem to be able to find anything that would suit my idea of a storyline, or mentaiko's amazing drawing style.. I was very sad this was a oneshot though, and I was frustrated after i saw that there's still lot's of his work untranslated 🙁 And now that mentaiko's spoiled me, I can't even read and like previous Yaoi/Shounen Ai series I've read and liked before!! 😐 I'm really at a loss here.. 😛 The hardcore level doesn't really matter, and I love high school themed ones. Especially the ones with some sort of a delinquent involved 🙂 (Since I am at high school 😀 ) Hate Crybaby Ukes 😛 Love Manly/Tall Semes 😃 So hit me with your suggestions! 😀

U Don't Know Me is the first one that popped into my head when you said delinquent/school related series! It is hard to find anything that is a lot like Mentaikio's art style because most yaoi is really girly. Here is a couple more you may like that is a little longer and meets what you are looking for....

Haru wo Daite Ita - it doesn't have the school setting or delinquents but the uke isn't a crybaby and both are quite manly. I would suggest all works by this author NITTA Youka
Dear Green: Hitomi no Ounowa and Dear Green by FUJIYAMA Hyouta as well as some of her other works
Gravity Eyes - The Uke is in College so it kinda fits 🙂
ANYTHING by Miyamoto Kano such as Hydra/Rules (These go together and in Hydra, they are all in High school. Make sure you read all of the oneshots that go along with it. This follows the main characters before they meet and then tells some stories of what happens in between volumes)
Cut is a really good High school one, if you don't mind angst
Also, NAONO Bohra has some good ones! Check her out! Her art is the most like Mentaikio's (well hers is the closest to Mentaikio's that I have read, anyway)

I will edit with more later when I can seriously look through my database...... Hope these will get you started though....

Look under the "Bara" category.

You should definitely check out Acid Town. Yuki (whom I'm assuming will end up being the uke) is definitely not a crybaby, he's a strong-willed guy, while Hyoudo (whom I'm assuming will end up being the seme) is tall and manly.

*Setting: not a school setting, but it deals with gangsters/yakuzas~>similar to the delinquent atmosphere you'd asked for.

It's become one of my favorite mangas! 😃

** "Be a rainbow in someone else's cloud."**

Aaand I'm back online(wrote bios from scratch[wonted moar overklok:3], flashed it before i could dump the original, bricked my MoBo, the new one arrived now xD) 🙂 😛

So anyway, thanks for all your answers! I checked everything out, and well, I've found new series to read now! 😀 GazeChic you were on the spot dude! 🙂 And Acid Town is now one of my favorites as well daydreamer! (Mentaiko drew a new one by the way, loved it too :3 )