There are two versions of this, one terrible and one, kinda hot. just, bare with me while I explain both.
So. The first (and worst) one is where Sans loses control and becomes a terrifying Gaster Blaster like Beast. He... well lets just say you wouldn't want to meet him alone in a dark alley. Hell, he wouldn't even FIT in said dark alley! (I couldn't find a picture)
The second, and my favourite, is where sans is merged with Gaster to create... a tall, unashamed, forward, hot, and generally awesome skeleton with the combined powers of both Gaster and Sans. (Yes, I have a crush on this awesome skeleton. Don't judge me!)
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Undertale AUs (in my opinion)
RandomHi! This is a random idea I came up with, and in it, I'll be listing every undertale au I know of, and (at least) every main character within them. In my point of view, of course. If anyone wants to share their views on any of them then fine by me...
