  We present high resolution 2.5-dimensional MHD simulation results of magnetic
breakout-initiated coronal mass ejections (CMEs) originating from a coronal
pseudostreamer configuration. The coronal null point in the magnetic topology
of pseudostreamers means the initiation of consecutive sympathetic eruptions is
a natural consequence of the system's evolution. A generic source region
energization process -- ideal footpoint shearing parallel to the pseudostreamer
arcade polarity inversion lines -- is all that is necessary to store sufficient
magnetic energy to power consecutive CME eruptions given that the
pseudostreamer topology enables the breakout initiation mechanism. The second
CME occurs because the eruptive flare reconnection of the first CME
simultaneously acts as the overlying pre-eruption breakout reconnection for the
sympathetic eruption. We examine the details of the magnetic and kinetic energy
evolution and the signatures of the overlying null point distortion, current
sheet formation, and magnetic breakout reconnection giving rise to the runaway
expansion that drives the flare reconnection below the erupting sheared field
core. The numerical simulation's spatial resolution and output cadence are
sufficient to resolve the formation of magnetic islands during the reconnection
process in both the breakout and eruptive flare current sheets. We quantify the
flux transfer between the pseudostreamer arcades and show the eruptive flare
reconnection processes flux ~10 times faster than the pre-eruption breakout
reconnection. We show that the breakout reconnection jets cause bursty,
intermittent upflows along the pseudostreamer stalk as well as downflows in the
adjacent pseudostreamer arcade, both of which may be observable as pre-eruption
signatures. Finally, we examine the flux rope CME trajectories and show that
the breakout current sheet provides a path of least resistance as an...
