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Umm I'm not sure but maybe it's this one. http://www.mangago.me/read-manga/kaihatsu_muramura_mode/

thanks swan, I saw that one before and its what prompted the older one I had read. Can't remember the title to save my life though haha.

Thanks anyway

If it helps any, the uke was trying to steal something at the beginning of the manga. Black hair, I believe a headband or something. Kind of a pinkish character

Punkish not pinkish

Lol and randomly enough I remember he had a mole right next to his asshole too hahah

The uke has a mole there but I'm not sure if it's the right one
http://www.mangago.me/read-manga/yankee_kun_to_pantsu_no_ouji_sama/

Or here's the mole tag xD
http://www.mangago.me/tag/Mole/

hey, thank you, that's a cool looking manga as well but unfortunately not the one.

I went through the mole tag with a fine tooth comb as well. Maybe it's too obscure or it's just old enough? Haha, thanks for the help.

I hope you find the right one :)
Try using the tags on Mangaupdates. They have "beauty mark"/ "birth mark". Try different combinations with 'thief/ves' or some other tag you remember is relevant. :)