Koi no Katachi
After this, read the spin-off 'Koi ni Narumade'.
Gekkouzaka no Hanayashiki
I'll have to be in the right mood to read this one. It has a depressed and suicidal mc, who is in self destruct mode, and deliberately does everything to push away the one who loves him, (and who he loves). They have a happy end, though, so it might give me hope that even Z can find (and keep!) true love. It seems to be quite well written, so it could be good, plus there's apparently also smut in there, (because one of the mc's methods to hurt himself and others, is promiscuity, just like Z), which might help to relieve the sadness for and annoyance with the mc.
Yokosu Inu, Mekuru Yoru
I wanna read this with bells on!!! But I'm gonna TRY and wait until it's finished...
Emotion Circuit
After this, read 'Fake Fur', then 'Three Quarters'.
Prince Charming
Read this for a change to the typical fluffy, romantic, monogamous couple type stories. See how you feel about all the 'free love' being shared around. Personally, I suspect that it may actually be a relatively realistic depiction of the way young gay men act.
Ten Ni Todoku Shiro