These are 2 yaoi series that some may like and some may hate, it really depends on personal preference! (You can find any series I post on mangago)
Sensei no Kudokikata by Mimu Kayuma
Plot - "There's no way you can run away from me-- I MUST HAVE YOU!" said the super-egotistic ex-host Hisakawa as he carried a bouquet of roses, to the beautiful yet uptight sensei, Shindo Misaki!! Under the masterful fingers of his pursuer, Misaki was assaulted by a powerful lust, which rendered him defenseless to Hisakawa's advances. Though in truth, it was Misaki's unconscious wanton responses that captured Hisakawa's heart! This is I guess cute story. But some people may not like it, since it involves rape. But for me I just like the cuteness and smut in this story, it's a good read if you don't mind rape in a yaoi!
Yume Yume Shinjuu by Kojima Lalako
Plot - For someone who has no recollection of their childhood, Yuzuru's been having the same dream over and over again. One where he and another boy are playing in a small shrine. But he can never figure out who the other boy is. Then one day, his brother Ryosuke brings home a classmate of his, named Takumi. Within the memories that Yuzura can not remember, he realizes that Takumi was his childhood friend and first love. Takumi reveals that he is ecstatic that Yuzuru remembers. Happy to meet his first love again, Yuzuru once again becomes attracted to him, but... Well...I cried. A lot. Still crying from the inside. This is just from fluff to darkness. It's not bad, but I personally prefer the cute endings, but yea, for people who do like dark stories and psychological yaoi's, this is a great manga!