https://www.mangago.me/read-manga/gyangu_no_kai_kata/
Maybe this one
https://www.mangago.me/read-manga/gyangu_no_kai_kata/
Maybe this one
https://www.mangago.me/read-manga/gyangu_no_kai_kata/mdx/iur_chapter-6/pg-1/
this is the only one that I remember
Does anyone here knows a bl where they were doing it and the top was saying smth like "you know, you keep saying "iku iku" and what does that mean?" Smth like that. Judging from the dialogue, i think it's an interracial couple