Mahiro and the Full-Cup Bra

Mahiro and the Full-Cup Bra (まひろとカップブラ, Mahiro To Kappubura) is Chapter 43.5 of Onimai: I'm Now Your Sister!. It was originally published in Volume 15 of the doujinshi which was released on December 30, 2020.

Summary
Mahiro's bust has finally grown large enough to upgrade to full-cup bras.

Plot
As Mihari is working on her computer in her room, a knock is heard at her door and she tells the person knocking to come on in. It turns out to be Mahiro, and Mihari asks her what's up, also noting that she looks troubled. Mahiro says that her chest is feeling a little tight, and Mihari gets worried. Mihari pulls out her stethoscope and asks Mahiro if she's feeling alright otherwise with no fever. Mahiro tell her to wait and says that she's not sick, rather than she has a more natural problem.

Mahiro takes off her sweatshirt and says that her trainer is just too small for her now, much to Mihari's shock. Mahiro asks if it shrunk in the wash or something. Mihari smiles as she realizes what is going on and tells Mahiro that she understands and will buy her some new ones. Mahiro thanks her and closes the door. Mihari then goes to work on her computer to take care of the issue.

A few days later, a package arrives in the mail for Mahiro. Much to Mahiro's shock, the package contains a regular full-cup bra. Mihari says that she figured it was time to move onto the real thing, much to Mahiro's disbelief.

Mahiro protests, saying that sports bra look like regular clothes so they're fine, but that this is way too embarrassing and refuses to wear it. Mihari tells Mahiro to calm down, and suggests that she try it on first. Mahiro tries to resist, but Mihari holds her in place and says to let her put in on. Mihari tries to make sure that Mahiro isn't spilling out to the side, while Mahiro lets out a shriek.

Mihari finishes, and Mahiro leans over all gloomy. She notes that the last shred of her dignity as a guy is gone, leading Mihari to wonder what makes this the last shred with all that she's been through.

In her room, Mahiro notes that this isn't so bad after all, and that it kind of makes her bust look bigger in it as well. Mahiro leans forward while looking in the mirror to get a good look at how good it looks.

Mihari suddenly comes in, and Mahiro shrieks in embarrassment, telling Mihari that she wasn't doing anything. Mihari just chuckles and tells Mahiro just to make sure no to post anything online; aka, no sexting. Mahiro points out that there's no way she would.

A few days later, Mahiro cries and tells Mihari that she can't unhook the bra by herself, telling Mihari that she has to do it for her. Mihari points out to Mahiro that it's easier if she turns it around so the clasp is in the front. Mahiro is shocked, noting that her world has been turned around as well.

Characters

 * Mahiro Oyama
 * Mihari Oyama

Trivia

 * This chapter marks the last time that Mahiro wears a sports bra. From this chapter onward, Mahiro wears full-cup bras.

第43.5话