Bitterly Sweet
Undertale fontcest fic, NSFW warning here and here only. A sexy, kink-filled fanfic that probably doesn't make sense canonly. Pairing: Stretch (Underswap Papyrus) & Slim (Fellswap Papyrus). Plot: Razz is on a training course with Alphys in Hotland, staying there for a few days. Since Slim is the little trained Mutt w...