when and why did kouichi get a tattoo? Did I miss something?' because I don't remember him having it before??
He received the tattoo when Caius finally came inside of him. It serves as a sort of marking but in reality it’s a magic tramp stamp.
It happened in the chapter where they bounded ヾ(❀╹◡╹)ﾉ~
Am I the only one who wants an omega byul