rec

https://www.mangago.me/read-manga/run_away_with_me_girl/
https://www.mangago.me/read-manga/so_do_you_wanna_go_out_or/
https://www.mangago.me/read-manga/opium/
https://www.mangago.me/read-manga/yume_no_hashibashi/
https://www.mangago.me/read-manga/composing_spring_in_this_room_where_cherry_blossoms_bloom/
https://www.mangago.me/read-manga/blind_passion/

best served cold
murmur
i want a girlfriend
happiness rides a broomstick (its shoujo ai atm but its sooooooo cute)
the wolf steals the sun
that senior
first love to you
anything! that’s okay

By mature, do you mean stories with women who are older than 18? If so, try these:
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/throw_away_the_suit_together/
https://www.mangago.me/read-manga/even_now_we_re_adults/
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/contract_worker_and_career_woman/
https://www.mangago.me/read-manga/curves_of_her_and_me/
https://www.mangago.me/read-manga/my_ex_girlfriend_became_my_boss/
https://www.mangago.me/read-manga/summer_trend/
https://www.mangago.me/read-manga/gap_pink_theory/
https://www.mangago.me/read-manga/chaser_game_w/
https://www.mangago.me/read-manga/anata_mitai_ni/
https://www.mangago.me/read-manga/teiji_ni_agaretara/
https://www.mangago.me/read-manga/the_marriage_partner_of_my_dreams_turned_out_to_be_my_female_junior_at_work/
https://www.mangago.me/read-manga/crescent_moon_and_doughnuts/
https://www.mangago.me/read-manga/ayaka_chan_wa_hiroko_senpai_wo_otoshitai/
https://www.mangago.me/read-manga/still_sick/
https://www.mangago.me/read-manga/love_only_the_body/
https://www.mangago.me/read-manga/program_me/
https://www.mangago.me/read-manga/ebisu_san_and_hotei_san/
https://www.mangago.me/read-manga/she_becomes_a_tree/
https://www.mangago.me/read-manga/straight_girl_trap/
https://www.mangago.me/read-manga/would_you_could_you/
https://www.mangago.me/read-manga/request_to_leave/
https://www.mangago.me/read-manga/the_one_i_yearn_for/
https://www.mangago.me/read-manga/hitogoto_desukara/
https://www.mangago.me/read-manga/gentle_flutters/

And if by mature you meant smutty stories, try these (everyone is 18+ in these stories, too fyi):
BDSM GLs:
https://www.mangago.me/read-manga/sadistic_beauty_side_story/
https://www.mangago.me/read-manga/marie_and_alex/
https://www.mangago.me/read-manga/sunstone_1/
https://www.mangago.me/read-manga/lilith_sirius/ (SEQUEL: https://www.mangago.me/read-manga/lilith_2/)
https://www.mangago.me/read-manga/toy_xx_box/
https://www.mangago.me/read-manga/i_adore_you_teacher_official/
https://www.mangago.me/read-manga/addictive_bing_zi/
https://www.mangago.me/read-manga/program_me/
https://www.mangago.me/read-manga/talk_dirty_to_me/
https://www.mangago.me/read-manga/only_to_you/
https://www.mangago.me/read-manga/pathetic_sunbae/ (dub-con, petplay)
https://www.mangago.me/read-manga/hottie_s_heel_uncensored/ (one-shot)

Uncensored GLs:
https://www.mangago.me/read-manga/addictive_bing_zi/
https://www.mangago.me/read-manga/sunstone_1/
https://www.mangago.me/read-manga/love_only_the_body/
https://www.mangago.me/read-manga/office_sweet_365/
https://www.mangago.me/read-manga/desperation_of_sister_isabella/
https://www.mangago.me/read-manga/beast_of_blue_obsidian/ (blood and gore, violence, slavery, human trafficking, sexual assault, child sexual assault, torture, master-servant relationship, noble-slave relationship, dub-con)
https://www.mangago.me/read-manga/to_my_neighbor_angel/ (in all chapters except the last two, the FL has a dick)
https://www.mangago.me/read-manga/hottie_s_heel_uncensored/ (one-shot)
https://www.mangago.me/read-manga/aki_chan_is_thinking/ (one-shot)

GLs that contain scenes of 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/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/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/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)

Strap-on usage in GLs:
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/the_dog_s_desire_and_the_reality_of_discipline_by_inuzuka_bowl/ (Love Live! doujinshi one-shot)

Completed (Smut):
https://www.mangago.me/read-manga/sadistic_beauty_side_story/
https://www.mangago.me/read-manga/moonlight_garden_kang_unnie/
https://www.mangago.me/read-manga/opium/
https://www.mangago.me/read-manga/kill_switch/
https://www.mangago.me/read-manga/pulse_ratana_satis/
https://www.mangago.me/read-manga/just_right_there/
https://www.mangago.me/read-manga/hateful_lady/
https://www.mangago.me/read-manga/bad_thinking_diary/
https://www.mangago.me/read-manga/fly_like_a_butterfly_sting_like_a_bee/
https://www.mangago.me/read-manga/the_playgirl_and_the_prince/
https://www.mangago.me/read-manga/the_neighbors_temptation/
https://www.mangago.me/read-manga/goodnight_cinderella/
https://www.mangago.me/read-manga/nakayoshi_onna_boukensha_wa_yoru_ni_naru_to_yadoya_de_mechakucha_ecchi_suru/
https://www.mangago.me/read-manga/club_katoto_chan/
https://www.mangago.me/read-manga/eat_u_up/
https://www.mangago.me/read-manga/pet_s_aesthetics/
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/umi_to_anata_to_taiyou_to/
https://www.mangago.me/read-manga/kill_me_now/
https://www.mangago.me/read-manga/please_pick_my_love_too/
https://www.mangago.me/read-manga/only_to_you/ (BDSM)
https://www.mangago.me/read-manga/the_wolf_steals_the_sun_athrea_scans/ (dub-con)
https://www.mangago.me/read-manga/are_you_only_going_to_study/ (age gap)
https://www.mangago.me/read-manga/talk_dirty_to_me/ (BDSM)
https://www.mangago.me/read-manga/program_me/ (BDSM)
https://www.mangago.me/read-manga/suimitsutou_ha_shoujo_ni_kajirareru/ (attempted gangrape on a side character)
https://www.mangago.me/read-manga/addictive_bing_zi/ (BDSM)
https://www.mangago.me/read-manga/to_my_neighbor_angel/ (in all chapters except the last two the FL has a dick)
https://www.mangago.me/read-manga/for_garbage/ (adultery)
https://www.mangago.me/read-manga/marie_and_alex/ (BDSM)
https://www.mangago.me/read-manga/damp_ascension/ (one-shot;dub-con)
https://www.mangago.me/read-manga/hottie_s_heel_uncensored/ (one-shot;BDSM)
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/the_soaking_wet_unnie_next_door_wants_me_to_touch_her_down_there/ (one-shot)
https://www.mangago.me/read-manga/aki_chan_is_thinking/ (one-shot)

On-going (Smut):
https://www.mangago.me/read-manga/asumi_chan_is_interested_in_lesbian_brothels/
https://www.mangago.me/read-manga/does_it_count_if_your_first_time_is_with_an_android/
https://www.mangago.me/read-manga/drunken_my_boss/
https://www.mangago.me/read-manga/love_only_the_body/
https://www.mangago.me/read-manga/trash_flower/
https://www.mangago.me/read-manga/murmur_temple_scan/ (dub-con)
https://www.mangago.me/read-manga/beast_of_blue_obsidian/ (blood and gore, violence, slavery, human trafficking, sexual assault, child sexual assault, torture, master-servant relationship, noble-slave relationship, dub-con)

aand i forgot to add : ‘just right there’