AICOMI

"Big Brother, you'll be nice to me today too, right?"

Miu, the step-sister who grew up with her brother since childhood, loves him more than anything in the world. One day, alone at home without their parents, Miu discovers a sexy cosplay costume hidden in her brother's room. "If I asked you to wear this...would you be happy, Big Brother?" Miu smiles innocently and shyly lifts her skirt. From that day on, her days as a "pet sister"—existing solely to satisfy her brother's desires—began.

Maid, nurse, bunny girl, school swimsuit, bloomers... No matter how embarrassing the costume, she'll obediently wear it, saying, "If you love me, Big Brother," and serve him with a sweet voice. "Tell me all the things you like about Big Brother?" The way she desperately serves him with her small body makes her look like a sex doll made just for him.

Her brother's orders are absolute.

She's never even considered refusing.

Because to Miu, being loved by her brother means the very meaning of life.

"More...stain me more, make love to me... I'm happy to be your little sister and masturbation pet, big brother...♡"

Extremely doting, complete submission, and cosplay service A sinful daily life begins, where a stepsister fully accepts her brother's sexual desires.