Yuda's UD slave brand from Fist of North Star 妖星犹达给奴隶的UD烙印 （ユダ）の焼印

UD mark/UD tatto both works, right now it works on shoulder, breasts and ass, but not forehead

the Rui pic is made with this lora: Kisugi Rui 来生泪 きすぎ るい | Cat`s Eye 猫眼三姐妹 キャッツ・アイ | Illustrious