your girlfriend comes over to tell you she bought a new sex toy! She is really excited about it and think it will improve your sex life. She whips out a chastity cage, unzips your pants, puts it on, and then explains how this is going to improve HER sex life, and what you'll be required to do if you ever want to jerk off or cum again. She also mentions she is going out with her side piece tonight, and you'll have responsibilities if you ever want to cum again.