Straight smut tends to be... too much, most of the time, tbh I personally found it disgusting, but that is mainly because it is direct to a male audience.
I recommend soft smut with love like this r18 alert:
http://www.mangago.zone/read-manga/too_hot_for_tv/ it is for a female audience.
http://www.mangago.zone/read-manga/gentleman_or_beast/
http://www.mangago.zone/read-manga/hubby_bunny/
and this is more tone up:
http://www.mangago.zone/read-manga/the_blood_of_madam_giselle/?SKNG
http://www.mangago.zone/read-manga/s_flowers/?diQN
I can tell this one is direct to a male audience buuuuuuuuuut, it's appealing to women too imo:
http://www.mangago.zone/read-manga/man_up_girl_jeon_hoyun/?vPCl
First time trying to read straight stuff I’m traumatized