Waterside Night and the third ending
https://www.mangago.zone/read-manga/define_the_relationship/
https://www.mangago.zone/read-manga/one_night_mate/
https://www.mangago.zone/read-manga/my_beloved_oppressor/ (there's not much groveling exactly but its adjacent. content warning: attempted suicide, mentions of miscarriage and physical torture)
On another note to the op, "waterside night" seme's groveling is bc he raped the uke while "the third ending" seme was just acted a generic vague asshole.
recs for manga manhwa manhua where ml or seme is really bad towards fl or uke and ends up having to grovel and chase for forgiveness ??