After school nightmare
Seems to fit you criteria perfectly. All the sex happening in this causes major character development. The main character is intersexed, though, but if that doesn't bother you I'd definitly reccomend it.

Quote from Vilde0806

The main character is intersexed, though, but if that doesn't bother you I'd definitly reccomend it.

That statement is funny because you're new. 🤣

Sarcasm just doesn't work over the internet.

Thanks for all the suggestions everyone! 😀 I haven't read most of them before, but I have read some of them, but thanks anyway. 🙂

Does the walker choose the path, or the path the walker?

try stuff by INUGAMI Sukune. it's seinen, but actually quite cute and lovely

Quote from silent killer

Quote from Vilde0806

The main character is intersexed, though, but if that doesn't bother you I'd definitly reccomend it.

That statement is funny because you're new. 🤣

Very clearly new. 😀 I think she's read it, though.

They say it's the thought that counts, but then they tell you, "The road to hell is paved with good intentions......"

Will no one scanlate Takahashi Miyuki?! T_T

Quote from Alannaeowyn

Quote from silent killer

Quote from Vilde0806

The main character is intersexed, though, but if that doesn't bother you I'd definitly reccomend it.

That statement is funny because you're new. 🤣

Very clearly new. 😀 I think she's read it, though.

May I ask why that is amusing? And you mean new as in new on Mangaupdates?
I really don't get it, but If you're going to make fun of people you should atleast explain why. I was just trying to be helpfull and comments like yours are rude and unescessary. If you're not going to be helpfull, you should keep it to yourself.

Quote from Vilde0806

Quote from Alannaeowyn

Quote from silent killer

[quote=Vilde0806] The main character is intersexed, though, but if that doesn't bother you I'd definitly reccomend it.

That statement is funny because you're new. 🤣

Very clearly new. 😀 I think she's read it, though.

May I ask why that is amusing? And you mean new as in new on Mangaupdates?
I really don't get it, but If you're going to make fun of people you should atleast explain why. I was just trying to be helpfull and comments like yours are rude and unescessary. If you're not going to be helpfull, you should keep it to yourself. [/quote]
Because no one ever cares about gender benders. Maybe if it was Hentai, yaoi, or something else like that... but gender benders aren't offensive. Trust me, I've read things 10000000000000000 times worse. Probably more then that.... anyway, people on mangaupdates are generally quite open minded, so I wouldn't worry about most things.
P.S They weren't laughing at you, but with you. 😛

Does the walker choose the path, or the path the walker?

yeah be cool, man. It wasn't an insult at you. It's just that we know our dragon lady a little better than you.

Sarcasm just doesn't work over the internet.

Oh, the close-knitness of this community is showing itself. How warm and pleasant.
And I'll add Kaze to Ki no Uta. Lots of sex-for-character-development here. Actually, there's sex-for-total-character-flip, too.

I definitely second whoever suggested Mars. Reading your first post, that came to mind pretty much immediately. I think it's just what you're looking for.. probably. It's a great series, though a little dramatic. ^__^

"Without you, today's emotions would be the scurf of yesterday's."

Thanks both of you for the suggestions. 😀

Does the walker choose the path, or the path the walker?

Anything by SHINJO Mayu? 😀
AHAHAHA kidding. Shinjo Mayu and character development.

Um, Kare First Love sounds like what you're looking for? But I'm going to assume you've already read it.

As someone else mentioned Model.

Its just more difficult to remember those details since they are kinda small.
But thanks for asking because I would have never thought of it but all these suggestions seem REALLY interesting. 🙂

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Thanks Kitteh, for the suggestion. 😀

Does the walker choose the path, or the path the walker?