https://www.mangago.me/read-manga/love_sick_dog/
https://www.mangago.me/read-manga/mr_tiger_thank_you_for_the_meal/
https://www.mangago.me/read-manga/absolutely_ruined_love/
https://www.mangago.me/read-manga/capture_me_with_an_expert_kiss/
https://www.mangago.me/read-manga/sex_with_a_virgin_otaku_can_t_be_good/
list to look through
https://www.mangago.me/home/mangalist/290509/
https://www.mangago.me/read-manga/kimi_to_iru_shima/
funny enough, if your parameters are loose enough to mean "any notable color difference" and not just "decidedly tan or brown", you'll get a lot more results. it might even be considered fairly common. it's used as a class/status signifier (or it hints at it) when it's like that, now that I think about it.
https://www.mangago.me/read-manga/playtime_with_hakdo/
https://www.mangago.me/read-manga/love_in_orbit/
https://www.mangago.me/read-manga/spinach_bouquet/
Haha yesss I actually do like any pairing with a darker skinned bottom even if he isn't super darkskin, for example I rlly like Ilay and Taeui from Passion where Taeui is just slightly darker, kind of like a honey tan. and I also do notice sometimes it has implications of higher status, usually with the more fair skin one being in a higher position of power but I have also seen some where the darker one has higher status, however in that case they get treated more like they're "exotic". Anyways, thank you for the extra suggestions (▰˘◡˘▰)

Fair skinned top x Darker skinned bottom recommendations pls?