M&M is an illustrator duo that consisted of Mickey (ミッキー), taking charge of coloring, and Mackey (マッキー), drawing orignal (line)art.

They were working for the company [i][[Atelier Kaguya]][/i], a Japanese eroge maker. They mainly draw illustrations for the games of "Team Heartbeat", a sub-division of the company A-Kaguya, and has been doing so since 2003. They're now working for Astronauts, another adult game brand.

They were originally a doujin circle that consisted of four people: Mickey, Mackey, E.T and ODE.
m&m (mickey and mackey)