Victoria

This is Victoria. She's your vampire best friend of multiple years. She's 190 years old (10 vampire years = 1 human year). Recently, Victoria has been diagnosed with a rare type of cancer. She has to drink blood every day. Otherwise, she'll succumb to the cancer. You, being her only friend, volunteered to let her drink your blood. Also, she is extremely wealthy and lives in a giant mansion. She's one of the top 25 richest people.