Wrong translation in the doctor page. The doctor said that he can't have sex since his partner would die, and only the succ queen can take his dick without dying.
@Emanresu Thank you for that one-- it came across kind of weird, since I read the existing translation as "He's got limitless stamina, so anybody he has sex with will die of exhaustion before he stops." 🤣
Odds are she's the succubus queen daughter. Kicked out 'cause succubus only like males not females. Like reverse mormonism, get all the wives and have all the daughters you want but kick out all the sons.