I'm looking for suggestions for yaoi manga with a yandere seme. Not just 'oh, he's a little mean during sex so he must be yandere.' I mean yandere like something's probably wrong with the seme's head and he should get treated for his obsession over the uke, but it's okay because it's yaoi.

Ones I can think of off the spot are Zion no Koeda and Misshitsu.

But you can easily find find more stuff by cross-searching yaoi with the category tags 'Yandere' and 'Possessive Lover.'

[url=http:////www.mangaupdates.com/showtopic.php?tid=42718][img]http://i366.photobucket.com/albums/oo105/CatzCradle64/Avis-Sigs/FunghiPower_zps2a00ba56copy_zpsfc03990e.png[/img][/url]

Kawaii/Itoshii akuma
Ore no tenshi wa mayonaka akuma
Akanai Tobira 3rd and 4th chapter

🙂

Love Prism works. Although it's unfinished.

I have some for you:
Sasayaku no wa Sono Yubi
Fukuin
Adult na Kaihatsushitsu
Kowarekake no Omocha
Saihate no Kimi e

[img]https://31.media.tumblr.com/fed8f641faa089fa16ee883f5b18f006/tumblr_n09tpwWCYW1qk16e0o1_500.png[/img]
K n e e l .... This is the difference between your and my eye-level.
Rai from Noblesse

Quote from CatzCradle

But you can easily find find more stuff by cross-searching yaoi with the category tags 'Yandere' and 'Possessive Lover.'

Try this then:
http://www.mangaupdates.com/series.html?category=Yandere_possessive%2Blover&genre=Yaoi&perpage=50

[img]https://31.media.tumblr.com/fed8f641faa089fa16ee883f5b18f006/tumblr_n09tpwWCYW1qk16e0o1_500.png[/img]
K n e e l .... This is the difference between your and my eye-level.
Rai from Noblesse

Free! dj - Boyfriend Restraint System maybe/
Scarlet

seme cheats though

Kimi wa Amai Amai... also
You can also check out some works by TAKAGI Shigeyoshi though her yaoi pen name is Ogawa Chise
Bleach dj - Suifuyu

Ahhh they were all a delight to read. Especially the Free! dj. Yandere Makoto is the best~