if you're just talking about the characters having a different skin tone then seriously check out under grand hotel, it's a really good story and the seme is black (really really good story o3o) and if you mean foreigner just as foreigner and it isn't really about the skin contrast then foreign love affair. also though he isn't the main seme in the finder series there is a character that gets his fair share of story time in the finder series (note, it's incomplete and takes a while to upload but it's a really good one) :)
Haven't checked this tag yet, thanks! c;
Aaah I love Under Grand Hotel, it's one of my favorites!! And I've already read the other 2 but thanks for the help!! :D
sorry I don't have more suggestions I'm so not good at remembering names
http://www.mangago.me/read-manga/razoku_no_hanayome/ thats very sexy too :P
Sorry if this sounds weird but I love seeing the contrast between the seme & uke's skin color (or like just darker colored/non-japanese characters in general). I've read a lot of the ones in the foreigner tag so I'm asking just in case I missed any good ones!! :D