A private video of Airi, a female body modification slave, undergoing anal expansion training. Airi, who longs for the appearance of a woman, uses the first person pronoun "boku" while obtaining a beautiful modified female body. Although she does not want to talk about the reason, the twist in Kokoro casts a shadow on her beauty and gives a glimpse of her hidden masochism. [Chapter 1] For Airi, who has polished her modified female body, her own anus is a female organ. By expanding and stimulating that female organ, the seemingly cool girl becomes aroused as a masochistic female. Her developed anus is just like a female organ. She sits on top of a long dildo standing on the table and swallows it easily. While moving her ass that has swallowed the dildo to the base, Airi strokes her penis. Her body reacts to the pleasure and bounces many times. After several flying fish-like spasms, Airi's penis squirts out. Airi, who has changed into a risqué high-cut swimsuit, is given her long-awaited Master's cock and performs a blowjob with an ecstatic expression on her face. Then, a vibrator is thrust into her excited asshole, and she serves him while crying. In the end, she receives her Master's cock and has a masochistic orgasm. After the semen is released into her anus, her Master uses his mouth to scoop it up and places it back into Airi's mouth. Airi drinks it all up. While the excitement of anal sex has yet to die down, Airi complains about her need to pee in the bathroom. With her penis still erect inside her swimsuit, she leaks a large amount of urine in front of the camera. [Chapter 2] In a bodycon dress that reveals her cleavage, Airi kneels in front of her Master, who is seated on a chair. "Please let me serve you," she hesitantly begs. She sucks her master's middle-aged penis while glancing at his expression. Her arms are crossed behind her back, reflected vividly in the large mirror behind her. She is instructed to swallow his penis all the way to the base, and continues the no-hands blowjob. It is her master's style to make her drink the saliva that has built up during the service. Airi is wearing a black collar, and her nipples, which have become hard with arousal, are clamped with tight nipple clips. Airi feels her nipples being pinched as they shake her soft, white, swollen breasts. Originally shy, she has her sexual sensations revealed one by one, and is made to repeat them out loud. Then she performs another blowjob. She is ejaculated into while still holding it deep in her throat, and she drinks every drop of semen.