Alt. title: ネオンサイン・アンバー | 琥珀色 霓虹灯 | Neon Sign Umber
From Seraphic Deviltry:
An expressionless club doorman meets a flashy boy at one of the many parties the place gathers. As someone who’s always been considered quite boring or an emotionless person, Saya-chan with his clumsy personality will make this man a more vivid one.
– chapter 4