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[FellSwap!Sans x Underfell!Sans]

I don't know how popular this ship is, I used to ship these two when I started to get into Undertale AUs.
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Tags: #undertalefandom #underfellsans #fellswapsans #sanscest #fypシ #underratedship #undertaleships #artistsoninstagram #artistsonbluesky #shipnameideas