  A simple scenario of long-lived dark matter is presented. Assuming lepton
number $(L)$ conservation with Dirac neutrinos, the neutral component of an
$SU(2)_L$ scalar triplet with $L=2$ is a suitable candidate, which decays to
two neutrinos. Exotic leptons with $L=-1$ may also play a role, and act as
anchors for small seesaw Dirac neutrino masses.
