A little gift for @rainbowchibbit!
They finally convinced me after so long to try drawing other AUs again (Underfell especially), because the entire reason I had stopped was because people took one look at the fact I put a collar on Red and immediately wrote it off as a kink.
(I actually got a lot of messages basically saying “I loved it… until I saw the collar :/” and “Ew how disgusting another sin thing”–)
I put a collar on him not only because it looks freaking TOUGH but because dogs respect collars and that’s absolutely perfect for my headcanon of the Fell bros where they have to put up a mean facade when in public. (Meanwhile, they’re your classic loving bros out of sight.)