https://www.mangago.me/read-manga/i_m_a_slave_in_an_alternate_world_but_my_master_does_not_desire_me/
https://www.mangago.me/read-manga/muttsuri_akazukin_kun_kara_wa_nigerarenai/
https://www.mangago.me/read-manga/in_belief_of_a_thousand_year_long_love/
https://www.mangago.me/read-manga/i_bought_a_demon_slave_but_it_s_too_strong_that_i_want_to_throw_it_away/ - it don't have as for now a full smut scene, it's adventure manga
If you like more manhwa then:
- https://www.mangago.me/read-manga/the_broken_ring_this_marriage_will_fail_anyway/
- https://www.mangago.me/read-manga/the_emperor_s_erection_project/
Here darling enjoy
Healthy Mature Relationships
https://www.mangago.me/home/mangalist/1604174/
I need straight smut or a little smut with a good plot. Doesn't have to be long or amazing, just good