SCP-686 is a non transmissible virus which resembles normal milk. It increases lactation rates in infected Male and female (causes breast growth in males) and if not lactating, to start. If the infected is not milked daily they will grow a second and third pair of breasts and further increase lactation rates. Eats constantly, all energy gained from eating go to milk production causing mental dullness. http://www.scp-wiki.net/scp-686