You told your crush about your chastity fetish years ago when you were both drunk. She stepped up and said she would be the keyholder. You’re still a virgin and she never seems to have your key when you’re around.
Since you're probably never getting unlocked again, you'll want to take next-to-no time to cum. She's really just thinking of you. Thank her by licking it all off her feet when you finish!
Your stepmom had a creative way of dealing with your college Horniness when you were home. No orgasms, just unlocking training to try to make you impotent.