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2boys alternate_universe animated animated_skeleton blush bottom_sans brothers deepthroat fellatio fontcest game games gif glowing_penis incest lizherubones male male/male male_only oral orange_penis papyrus_(underswap) papyrus_au papysans sans_(underswap) sans_au sex siblings skeleton solo_focus sucking sucking_penis swapcest top_papyrus undead underswap undertale_au undertale_fanfiction unseen_male_face video_games yaoi
2boys alternate_universe animated animated_skeleton blush bottom_sans brothers deepthroat fellatio fontcest game games gif glowing_penis incest lizherubones male male/male male_only oral orange_penis papyrus_(underswap) papyrus_au papysans sans_(underswap) sans_au sex siblings skeleton solo_focus sucking sucking_penis swapcest top_papyrus undead underswap undertale_au undertale_fanfiction unseen_male_face video_games yaoi
2010s 2016 alternate_universe blue_blush blue_body blue_penis blue_tongue blush brosboning brothers ectobody ectopenis english_text fontcest incest male papyrus_(underswap) papyrus_au papysans penis sans_(underswap) sans_au siblings sitting sitting_on_lap skeleton swapcest sweat text tongue tongue_out underswap undertale_au yaoi
2010s 2016 alternate_universe blue_blush blue_body blue_penis blue_tongue blush brosboning brothers ectobody ectopenis english_text fontcest incest male papyrus_(underswap) papyrus_au papysans penis sans_(underswap) sans_au siblings sitting sitting_on_lap skeleton swapcest sweat text tongue tongue_out underswap undertale_au yaoi
2boys alternate_universe animated_skeleton blue_tongue blush bottom_sans brothers cigarette ectopenis fontcest gay_sex glowing_penis incest laying_on_bed lizherubones lying_on_bed male male/male male_only on_bed orange_penis papyrus_(underswap) papyrus_au papysans penis riding_penis sans_(underswap) sans_au sex siblings skeleton swapcest tongue_out uke_sans undead underswap undertale_au yaoi
2boys alternate_universe animated_skeleton blue_tongue blush bottom_sans brothers cigarette ectopenis fontcest gay_sex glowing_penis incest laying_on_bed lizherubones lying_on_bed male male/male male_only on_bed orange_penis papyrus_(underswap) papyrus_au papysans penis riding_penis sans_(underswap) sans_au sex siblings skeleton swapcest tongue_out uke_sans undead underswap undertale_au yaoi
2boys alternate_universe bottom_sans brothers deepthroat fellatio fontcest grabbing_head head_grab incest male male_only oral papyrus_(underswap) papyrus_au papysans sans_(underswap) sans_au seme_papyrus siblings skeleton solo_focus sucking_penis swapcest thegreatrouge top_papyrus uke_sans underswap undertale_au unseen_male_face yaoi
2boys alternate_universe bottom_sans brothers deepthroat fellatio fontcest grabbing_head head_grab incest male male_only oral papyrus_(underswap) papyrus_au papysans sans_(underswap) sans_au seme_papyrus siblings skeleton solo_focus sucking_penis swapcest thegreatrouge top_papyrus uke_sans underswap undertale_au unseen_male_face yaoi