Crystal harem, ameiro paradox, Gattendou Tenmatsuki, Toricon Triple Complex
Buddy System
http://www.mangago.me/read-manga/uchi_no_tantei_shirimasen_ka/
i also have a list if you wanna check those out:
http://www.mangago.me/home/mangalist/832/?filter=&page=1
I'm looking for any good yaoi dective manga when the couple work together. Thanks in advanced.