Kousoku Syndrome
Even though both stories are about S&M (kinks) it still was alright; in both cases the S side wasn't really sadistic, but only trying to please the M. The first one contains a 17 dealing with his trauma of being abused as a child. But it's not shown explicitly and doesn't make the reader feel too uncomfortable. Preferred the second story (chapter 5 and 6) as it was a little more lighthearted.
Marionette (Cereal)
At least it was self aware that the non-consensual sex and controlling is not to be idolized, but something to flee from. Even though the uke was "killed" by the seme at the end it seemed the seme dying was happier that he at least tried to run. Also the seme is a puppet/machine created by the uke.
Kirei ni Shiteyo
There is no fluff at all! It's serious and sad... The bullying and attempted rape are making it hard to bear. Though it has a happy ending. The only reason I bumped the rating up to 3 stars is because the relationship between the two main characters is emotionally healthy and respectful. But don't reread.
Hotel Phryne