Ze - Kami no Hon
So much quality Genma x Himi in this, and Asari & Shoui too! Slice of life oneshot sequels to Ze.
Ze Dear+ 2012 Extra
A repeat of the oneshot included in the main series on this site, with Asari bringing Himi to a piano bar.
Mujihi Na Anata
Nanao and Aikawa continue their passionate love affair with a dose of "I thought I was the only one in love!" and the return of the person who caused Nanao some emotional trauma.
Mujihi Na Karada
The third installment of Nanao and Aizawa's love affair, this time featuring ex-girlfriend-induced confidence issues that lead to heavy drinking, a night at sensei's, and a lot of makeup sex. Things end okay for these two.
Kaze No Yukue
Warudakumi Ni Mo Hana Wa Furu
The continuation of the story between the guy obsessed with money and the guy who got rich so they could be together. Also features a two-chapter story about a man (Takao's best friend who pretended to cheat with his wife in the other story) who falls for a kid he meets on the train. I would've *loved* that to be the main story and 10x the length. Really good potential for character development. Too rushed for 2 chapters but still a nice ending.
Therapy Game Restart
The next stage of the relationship: moving in together
Stigmata - Aikon
A supernatural police drama about a detective and his subordinate, whose body reacts to crime scenes and recreates a person's last moments. This is the BL sequel to the original seinen.
K-Sensei no Furachi na Junai