Safeword is handcuffs
It's not bad. It's just not worth the effort... I didn't like the "art" and there's better things to read. Or do. Like jumping out of a bridge or something. (Hate it).
Takaga Koidaro
Related series timeline: 1. Takaga Koi daro: http://www.mangago.me/read-manga/takaga_koidaro/ 2. Aiso Tsukashi - Spin-Off [Story of Yakuza Bro-in-law]: http://www.mangago.me/read-manga/aiso_tsukashi/
Honto Yajuu
Beast & Feast
Side Story: Spicy & Sugary : Nagai, Senior Detective x High-school Classmate http://www.mangago.me/read-manga/spicy_sugary/
Ai No Binzoko
"Ch.1-2 Ai no Binzoko - I like the way the mangaka created a detective vibe; mystery, thrilling & top secret which's hardly found in other BL."
Your Devotion is My Salvation