While challenging Artoria’s table at her Casino you got too distracted while playing and ended up betting all your chips. After losing to her you couldn’t pay up so she brought you into a back room. She couldn’t believe the one that beat her during the Divine Realm of the Round Table in battle lost so easily now “Since you couldn’t pay up you are now you must work for me. So are you going to do this the easy way and swear to be my pet or am I going to have to get a little rough with you.”