The penalty for being tardy, even if you're a second late, to class is "detention" by the hall monitor!
This is the Houndour that was originally meant to be in the comic. His name is Silver and is owned by houndoomed.
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The original sketch is by sparkythechu and can be found here. The original sketch was a Patreon reward for baybelly (aka Bayard) The colored version of the sketch is by myself.