Gooning

Pick your poison:

Uncensored:
https://www.mangago.me/read-manga/beast_of_blue_obsidian/
https://www.mangago.me/read-manga/addictive_bing_zi/
https://www.mangago.me/read-manga/sunstone_1/
https://www.mangago.me/read-manga/otome_saku/
https://www.mangago.me/read-manga/shoujo_sect/
https://www.mangago.me/read-manga/love_only_the_body/
https://www.mangago.me/read-manga/the_promiscuous_relationship_of_the_president_and_vice_president/
https://www.mangago.me/read-manga/girls_in_bloom/
https://www.mangago.me/read-manga/office_sweet_365/
https://www.mangago.me/read-manga/to_my_neighbor_angel/
https://www.mangago.me/read-manga/this_brat_is_constantly_thirsting_for_step_mommy/ (one-shot)
https://www.mangago.me/read-manga/desire_in_the_dark/ (one-shot)
https://www.mangago.me/read-manga/ojou_sama_to_maid_san_ga_yuri_yuri_suru_manga/ (one-shot)
https://www.mangago.me/read-manga/hottie_s_heel_uncensored/ (one-shot)
https://www.mangago.me/read-manga/aki_chan_is_thinking/ (one-shot)

Strap-ons:
https://www.mangago.me/read-manga/love_my_boss_wife/
https://www.mangago.me/read-manga/toy_xx_box/
https://www.mangago.me/read-manga/sunstone_1/
https://www.mangago.me/read-manga/beast_knights/
https://www.mangago.me/read-manga/illicit_uncensored/
https://www.mangago.me/read-manga/lilith_sirius/ (SEQUEL: https://www.mangago.me/read-manga/lilith_2/)
https://www.mangago.me/read-manga/the_girl_i_hated/
https://www.mangago.me/read-manga/for_garbage/ (side story only)
https://www.mangago.me/read-manga/to_my_neighbor_angel/ (in all chapters except the last one, the FL has a dick so it kind of counts lol)
https://www.mangago.me/read-manga/futanari_no_elf/ (futanari so I guess you can count it idk)
https://www.mangago.me/read-manga/the_dog_s_desire_and_the_reality_of_discipline_by_inuzuka_bowl/ (Love Live! doujinshi one-shot)

Scissoring:
https://www.mangago.me/read-manga/sadistic_beauty_side_story/
https://www.mangago.me/read-manga/club_katoto_chan/
https://www.mangago.me/read-manga/semelparous/
https://www.mangago.me/read-manga/eat_u_up/
https://www.mangago.me/read-manga/asumi_chan_is_interested_in_lesbian_brothels/
https://www.mangago.me/read-manga/pet_s_aesthetics/
https://www.mangago.me/read-manga/fly_like_a_butterfly_sting_like_a_bee/
https://www.mangago.me/read-manga/the_promiscuous_relationship_of_the_president_and_vice_president/
https://www.mangago.me/read-manga/love_only_the_body/
https://www.mangago.me/read-manga/kill_me_now/
https://www.mangago.me/read-manga/ando_oshida_motto_nakayoku/
https://www.mangago.me/read-manga/megami_sama_ni_yakedo_suru_hodo_kogasaretai/
https://www.mangago.me/read-manga/office_sweet_365/
https://www.mangago.me/read-manga/love_does_not_fade/
https://www.mangago.me/read-manga/otome_saku/
https://www.mangago.me/read-manga/umi_to_anata_to_taiyou_to/
https://www.mangago.me/read-manga/can_t_forget/
https://www.mangago.me/read-manga/only_to_you/
https://www.mangago.me/read-manga/lady_black_is_depressed/ (non-con in chapters 14&15)
https://www.mangago.me/read-manga/yurika_to_kawakanai_shiitsu_midare_yuri/ (one-shot)
https://www.mangago.me/read-manga/on_the_promised_night/ (one-shot)
https://www.mangago.me/read-manga/hidden_meaning/ (one-shot)
https://www.mangago.me/read-manga/aki_chan_is_thinking/ (one-shot)
https://www.mangago.me/read-manga/the_law_of_universal_gravitation/ (one-shot)
https://www.mangago.me/read-manga/futari_no_kako_wa_mamanaranai/ (one-shot)
https://www.mangago.me/read-manga/angel_s_paraphilia/ (one-shot)
https://www.mangago.me/read-manga/ojou_sama_to_maid_san_ga_yuri_yuri_suru_manga/ (one-shot)

Hey, can you recommend me horror GL? Or any GL with adults!

Horror GLs:
https://www.mangago.me/read-manga/the_wind_spell/
https://www.mangago.me/read-manga/mietemasu_yo_aizawa_san/
https://www.mangago.me/read-manga/murcielago/
https://www.mangago.me/read-manga/liberta/
https://www.mangago.me/read-manga/a_lady_s_table/
https://www.mangago.me/read-manga/do_you_think_someone_like_you_could_defeat_the_demon_lord/
https://www.mangago.me/read-manga/strange_tales_of_kisaragi/
https://www.mangago.me/read-manga/kono_ai_wo_owarasete_kurenai_ka/
https://www.mangago.me/read-manga/yoarashi_ni_warau/
https://www.mangago.me/read-manga/seiren/
https://www.mangago.me/read-manga/isekai_picnic/
https://www.mangago.me/read-manga/bead_master/
https://www.mangago.me/read-manga/the_garden_of_plantus/
https://www.mangago.me/read-manga/paranormal_club_on_the_supernatural_phenomena_of_m_prefecture_s_y_city/
https://www.mangago.me/read-manga/shura_no_hakoniwa/
https://www.mangago.me/read-manga/liar_satsuki_can_see_death/ (GL subtext only)
https://www.mangago.me/read-manga/suicide_girl/ (GL subtext only)
https://www.mangago.me/read-manga/smile_it_s_just_a_dream/ (one-shot)
https://www.mangago.me/read-manga/i_m_bound_by_miho_chan/ (one-shot)
https://www.mangago.me/read-manga/game_of_murder/ (one-shot)
https://www.mangago.me/read-manga/happy_end_for_you/ (one-shot)
https://www.mangago.me/read-manga/yabai_hito_ni_hitomebore_suru_hanashi/ (one-shot)
https://www.mangago.me/read-manga/i_love_you_hanatsu_yaya/ (one-shot)

GLs with adult couples:
https://www.mangago.me/read-manga/tsumetakute_yawaraka/
https://www.mangago.me/read-manga/love_my_boss_wife/
https://www.mangago.me/read-manga/pulse_ratana_satis/
https://www.mangago.me/read-manga/please_pick_my_love_too/
https://www.mangago.me/read-manga/watashi_to_kanojo_no_kawaii_koi_no_hajime_kata/
https://www.mangago.me/read-manga/threads_of_me_and_you/
https://www.mangago.me/read-manga/wicked_spot/
https://www.mangago.me/read-manga/private_photos/
https://www.mangago.me/read-manga/summer_trend/
https://www.mangago.me/read-manga/oni_ure_idol_ga_kyou_mo_watashi_wo_oshitekuru/
https://www.mangago.me/read-manga/there_are_always_teachers_who_want_to_ask_out_parents_unofficial/
https://www.mangago.me/read-manga/akumade_amai_watashi_no_kanojo/
https://www.mangago.me/read-manga/sherbet_above_the_sea_of_fog/
https://www.mangago.me/read-manga/onna_tomodachi_to_kekkon_shitemita/
https://www.mangago.me/read-manga/after_the_curtain_call/
https://www.mangago.me/read-manga/sadistic_beauty_side_story/
https://www.mangago.me/read-manga/a_joyful_life/
https://www.mangago.me/read-manga/opium/
https://www.mangago.me/read-manga/what_does_the_fox_say/
https://www.mangago.me/read-manga/crescent_moon_and_doughnuts/
https://www.mangago.me/read-manga/hanamonogatari/
https://www.mangago.me/read-manga/teiji_ni_agaretara/
https://www.mangago.me/read-manga/still_sick/
https://www.mangago.me/read-manga/ayaka_chan_wa_hiroko_senpai_wo_otoshitai/
https://www.mangago.me/read-manga/ring_my_bell/
https://www.mangago.me/read-manga/octave/
https://www.mangago.me/read-manga/shwd_pseudo/
https://www.mangago.me/read-manga/so_do_you_wanna_go_out_or/
https://www.mangago.me/read-manga/her_shimcheong/
https://www.mangago.me/read-manga/blooming_sequence/
https://www.mangago.me/read-manga/swallow_tail/
https://www.mangago.me/read-manga/my_dear_enemy/
https://www.mangago.me/read-manga/cheerful_amnesia/
https://www.mangago.me/read-manga/love_thy_neighbor_2/ (age gap, adultery, toxic relationship, religious themes)
https://www.mangago.me/read-manga/black_white_sal_jiang/ (toxic relationship, violence)
https://www.mangago.me/read-manga/run_away_with_me_girl/ (been a while since I've read it, but I think there might be a mild depiction of spousal abuse)
https://www.mangago.me/read-manga/a_star_s_warmth_a_returning_dream/ (age gap, but they're both adults dw)
https://www.mangago.me/read-manga/brides_of_iberis/ (adultery)
https://www.mangago.me/read-manga/even_now_we_re_adults/ (adultery)

Omg! Thanks so much! Sorry to ask again but any horror GL with adults except the ones you already mentioned? I've been trying to find a good read. Thanks once again for all the above!

Hmm, maybe these? Although they fall more into the creepy/dark atmosphere or dark-fantasy/dark-psychological territory rather than straight-up horror territory ngl:

https://www.mangago.me/read-manga/scarlet_yuino_chiri/
https://www.mangago.me/read-manga/okiku_san_wa_ichatsukitai/
https://www.mangago.me/read-manga/a_girl_who_longed_to_be_a_hero_aims_to_be_a_hero_even_if_she_falls_into_a_vampire/
https://www.mangago.me/read-manga/the_hero_s_killer_bride/
https://www.mangago.me/read-manga/and_kaede_blooms_gorgeously/
https://www.mangago.me/read-manga/gunjou/
https://www.mangago.me/read-manga/snowhite_s_doorbell/
https://www.mangago.me/read-manga/gokumon_nadeshiko_koko_ni_ari/
https://www.mangago.me/read-manga/mahou_shoujo_tokushuusen_asuka/
https://www.mangago.me/read-manga/let_s_kill_your_husband/
https://www.mangago.me/read-manga/killing_mr_park/
https://www.mangago.me/read-manga/ghosts_of_greywoods/

Thanks once again!:D