This work is an amateur submission featured in an SM magazine. All contributor names are pseudonyms, and the submitter appears under the alias ◎ Alice (21 years old). She is a female college student who has established herself as the beloved slave of her master, Mr. Otaki (pseudonym), who is nearly 20 years her senior. Due to the oppressive atmosphere during the pandemic lockdown, she accepted her first SM training. One year into her training, Alice was given a collar as a commemoration, and while trembling with humiliation, she continues to learn the sensation of reaching orgasm through her anal passage.