I know, it's tragic... I've developed a thing for shoujo smut...
Bring on the cliches!
I also happen to have a thing for mangas with a psychological theme as well, so I love when they are combined! Watashi No Megane-kun is a pretty good example of this.
Basically, I like male leads who are a tad bit psycho.... Like, extremely possessive, or have anger-management problems, or any sort of deep-rooted psychological issue.....
I know there is a thread somewhat similar to this, but I've read everything that was suggested!
If this is too specific, I really would love any smut suggestions you might have!

Some mangas like this that I have already read, and enjoyed:
Watashi no megane-kun
Everything by Shinjo Mayu and minami kanan
Hot Gimmick
Hana Yori Dango
Desire Climax
100% Perfect Girl
Mars
Mitsuxmitsu drops

I hope there's someone out there that can suggest something, but if not thank you for reading this anyways!

Can't make any suggestion as I don't read those. But if I were you, I'd venture into hentai.

I HATE shoujo smut with all those cliches but these are some that I actually enjoyed..

Quote from Kittentalk

or any sort of deep-rooted psychological issue.....

Hakuji <-- definitely fits your criteria
Shinobi No onna <-- even this
Toriko Aigan Shoujo <-- and this
Doll Garden<-- and also this
Bocchama wa Ijiwaru
Shura to Otome
Otoko Hime to Mahou no Lamp
Chou yo Hana yo <-- this too
Blackbird

All of them have obsessive bishies, smut but very good smut..

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[color=black]The Hidden Agenda=[/color][color=red]Gol.D.Ace[/color]

[color=black]This Week's favourite:[/color]
DoLL (Okado Tatsuya)
Xp

Ai Daro
Midnight Secretary
It's Not Like that, Darling
Ikenai Teacher, Iketeru Darling
Private Prince by Enjouji Maki
and any manga by Yoshihara Yuki or Kayono

I read Hapi Mari and really enjoyed it. Looks like it's going to be smut-tastic.

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shojo reviews, news, opinions, and more. Check it out!

I'd say the best smut is Yoshihara Yuki's smut. :3

Hrodulf and Bjornolfr, you will not be forgotten.
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[color=black]And if the world were black and white,
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Click 'n Play!

If I had a fantasy self, it'd be a tentacle monster.

hi...well i am not sure if i helped...but i hope i could ^^;;

tad pshyco, possessive...

First thing, please go through all of Yoshihara Yuki's work
then after that, dig on to Enjouji Maki's
and also go through OHMI Tomu
then after that dig on those one volumes which like

Mamotte Agemasu <-- the main male character is involved in a gang =O
Ubatte Agemasu <-- the guy in devil's ex boyfriend oneshot possessive in some terms
Jikiru de Haido na Kare <-- i don't remember the plot...but it has something to do with the guy having weird personalities OTL

Kimi ni Furetara <-- this has nothing to do with your storyline...but i find it to be a very nice to read oneshots compilation

that is what i could reccomend since this are some of the titles i have read and remembered ^^;;;

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Yaaaaaaay, these all sound awesome. I'm definitely checking them out! Thanks to everyone that replied, these were great suggestions =D!!!!

hot gimmick g[m] grrrrrrrrrreat smut!

Reading Love LuckyRecommended B Gata H Kei <3 Conveni-N XD

readd everything by SAIJOU Ayano <3! (:

I second Chou yo hana yo and Midnight Secretary, It's Not Like That, Darling, and Private Prince.

Shura to Otome was definitely interesting too. =)

I add: Boku ni Natta Watashi, and Uwasa no Midori-kun. (I like gender bender smuts for some reason.)

If you've ever thought or said "Nice Guys finish last" and really meant it, then you should probably read this LJ post by DivaLion. It's incredibly insightful whether you're male or female.

From a bumper sticker I like:
"If you're gonna ride my ass, at least pull my hair."