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1boy 2020 2020s 2d after_sex alternate_universe animated_skeleton artist_name blush condom ectoplasm heki_(artist) heterochromia humanoid laying_on_side male male_only pants_around_legs sans sans_au skeleton solo solo_male undertale undertale_(series) undertale_au undertale_fanfiction used_condom yaoi

1boy 2020 2020s 2d after_sex alternate_universe animated_skeleton artist_name blush condom ectoplasm heki_(artist)heterochromia humanoid laying_on_side male male_only pants_around_legs sans sans_au skeleton solo solo_male undertale undertale_(series)undertale_au undertale_fanfiction used_condom yaoi

1boy 2020 2020s 2d after_sex alternate_universe animated_skeleton artist_name blush condom ectoplasm heki_(artist) heterochromia humanoid laying_on_side male male_only pants_around_legs sans sans_au skeleton solo solo_male undertale undertale_(series) undertale_au undertale_fanfiction used_condom yaoi

1boy 2018 animated_skeleton blue_blush blue_eyes blush blushing bottomless dialog dialogue dialogue_box drool drooling gay grabbing_own_leg heki_(artist) legs_apart legs_held_open legs_spread legs_up male male_only sans skeleton solo solo_male spread_legs text text_box undertale undertale_(series) undertale_sans

2020 2020s 2d ? alternate_universe animated_skeleton artist_name blue_eyes blush confused confused_look confusion dream_sans dream_sans_(fan_character) dreamtale ectoplasm error_sans error_sans_(fan_character) errortale heki_(artist) humanoid ink_sans ink_sans_(fan_character) inktale male male/male male_only mars_symbol pulling_up_shirt sans sans_au sex_toy skeleton spoken_question_mark star_eyes underswap underswap_sans undertale undertale_(series) undertale_au undertale_fanfiction yaoi