LOL....the heading of you question reminded me of 50 shades of grey :P
Anyways, the mangas i remember are, where the seme is being more like, bruised up than bloodied up. If that works then you can check out -
http://www.mangago.me/read-manga/love_mode/ (Aoe x Naoya's story)
http://www.mangago.me/read-manga/sweep/
And if it helps, I have a biting list - http://www.mangago.me/home/mangalist/57936/ (but most of them have seme biting the uke actually)
oh god, 50 shades LOL anyway, i know it's a weird request but thanks! i guess i'll just try to be happy with semes biting ukes lolll
so you always see semes biting their ukes' lips in yaoi but are there any stories where it's the uke who bloodies up the seme instead??? ty :)