gelbooruhttps://xbooru.com/index.php?page=atom&tags=2010s 2016 alternate universe blue blush blue body blue penis blue tongue blush brosboning brother and brother brothers ectobody ectopenis english text fontcest incest male papyrus (underswap) papyrus au papysans penis sans (underswap) sans au sitting sitting on lap skeleton swapcest sweat text tongue tongue out underswap undertale au yaoi2024-05-26T02:03:25Zgelbooru