Yeah, it's kind of weird but I was looking for a guy dressing like a girl OR a feminine looking boy, but not shounen-ai nor yaoi.
An example could be Shouri no Akuma, Usagi no Tsuno, Twelve Nights, etc.
With romance but not with a boyish girl. I think this one will be kind of hard, thanks for the help!

It can be manhwa, manga, etc.

Fudanshism - Fudanshi Shugi
Mizuho Ambivalent
Otome wa Boku ni Koishiteru
AKB49 - Renai Kinshi Jourei
Boku x Kano

These should fit what you are looking for. They are all about guys who start cross dressing to be with the girl they like, or are already cross dressing and start to have feelings for a certain girl.

Most genderbenders I've seen feature straight crossdressers.

Kuragehime
Usotsuki Lily
Nicoichi
Alto
Yubisaki Milk Tea
Pretty Face
Kunisaki Izumo no Jijou - light on romance
Kyoumen no Silhouette
Id - Id looking like a girl is a running gag

Hourou Musuko about a boy wanting to be a girl, dressing like a girl and [spoiler about the end]

later falling in love with a feminine girl. First she falls in love with a boyish girl, but they don't have a relationship. The one he has a serious relationship is a model.

Also, not really a trap, to tell the truth. What I understand as trap is a boy who dress as a girl and they don't really know if he is a boy or a girl (like Prunus Girl). In HM, the boy doesn't always dress as a girl.

Never really read it, but maybe Usotsuki Lily?

There's also Boku to Boku, but the girl is boyish. She wishes she wasn't though, if that counts.

ヾ(:3ﾉｼヾ)ｼ

Maybe baka to test to shoukanjuu. Although it is not so much the male lead that looks girlish, but the male lead's friend.

Himegoto - Juukyuusai no Seifuku

Main guy likes to cross dress as a girl.

Favorite Shoujo mangaka:
TAKANO Ichigo
Robiko
IKETANI Rikako
ASHIHARA Hinako
YOSHINAGA Yuu
AOKI Kotomi

Favorite Shoujo Scanlation Group:
Forbidden Garden

Kanchigai Hime to Usotsuki Shimobe

Shounen Oujo 😀

Awesome story, btw.

Kuragehime
[m]Ranma 1/2{/m]
The Changelings

All enjoyable reads. 🙂

I give up. I see not point in living if I can't be beautiful.

mmmm maybe

Dress na Boku ga Yangotonaki Katagata no Kateikyoushi-sama na Kudan
Maria Holic

[img]http://puu.sh/8KZ1O.jpg[/img]

Zippy Ziggy There's a lot of the main character cross dressing in this series.

Thanks everyone! Does anyone have more?

Sayonara Kodomotachi - the only one I can think of at the moment. It's a oneshot though.

Remembrance, a forsaken thing that revokes ignorance and leaves people in doubt, is my only redemption and solace deep within the cascade of white.

The evergreen trees speak of days long past when music mingled with the wind and sweet murmurs brushed our cheeks.

Dark Air fits i think

stupid photobucket, wanting $400/yr just to display your images