Im

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Sensei ni, Ageru this is the only thing that comes to mind.
I know some more that are more fitting, but this is the best for now.

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mars i'm not sure if it completely fits but i think it's great and it's the first thing that comes to mind 😃

[img]http://i.imgur.com/atMHiLJ.jpg[/img]

Do you care if the manga is terrible as long as it fits the guidelines?
In that case, Kare no Ondo fits perfectly.
. Eden no Hana was cancelled because of plagiarism, but it fits as well.

I can't think of much else having to do with romance that'd I've read, but you could try these links:
http://www.mangaupdates.com/series.html?category=Abuse&genre=Romance&exclude_genre=Shoujo%2BAi_Shounen%2BAi_Yaoi_Yuri&perpage=50
http://www.mangaupdates.com/series.html?category=Abusive%2BFather&genre=Romance&exclude_genre=Shoujo%2BAi_Shounen%2BAi_Yaoi_Yuri&perpage=50
http://www.mangaupdates.com/series.html?category=Abusive%2BParent%252Fs&genre=Romance&exclude_genre=Shoujo%2BAi_Shounen%2BAi_Yaoi_Yuri&perpage=50
http://www.mangaupdates.com/series.html?category=Domestic%2BViolence&genre=Romance&exclude_genre=Shoujo%2BAi_Shounen%2BAi_Yaoi_Yuri&perpage=50
http://www.mangaupdates.com/series.html?category=Child%2BAbuse&genre=Romance&exclude_genre=Shoujo%2BAi_Shounen%2BAi_Yaoi_Yuri&perpage=50

Hatsukoi ni Oboreta (the title story)

Hmm... maybe you'll like You're Egg! It's not really that good IMO, but it sort fits what you're looking for...

Thanks

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Quote from MissJanny

Eden no Hana was cancelled because of plagiarism, but it fits as well.

And that's too bad because I really enjoyed that manga. Luckily it had a pretty good ending still.