Warming Drug

The Warming Drug is a special drug developed by Mihari Oyama for her brother Mahiro. Although on the surface it appears to help improve Mahiro's circulation and make her feel warmer, thus the name, it actually acts as a temporary suppressor of some of the effects of the Feminization Drug.

Overview
During the winter, Mahiro started to feel cold due to her decreased circulation as a side effect of transforming into a girl. Seeing her peril, Mihari decided to develop a special drug for Mahiro to counter the effects. Unlike the Feminization Drug, only a small amount is needed for the effects to kick in, and the effects appear to only last a short amount of time much akin to the fast-acting variant of said drug.

The Warming Drug, as named by Mahiro, was designed specifically for Mahiro to make her feel warmer. Although it appears to just improve circulation, it actually acts as a temporary suppressor of the effects of the Feminization Drug. Thus, Mahiro feels warmer due to her body becoming slightly more manly temporarily.

Mihari designed the drug specifically for Mahiro, and thus it causes trouble when used on someone else. When Momiji took some, she started feeling warmer in her belly, but the warmth quickly grew so intense that she began to feel dizzy, and Mahiro took her into her room to rest. Eventually, the effects of the drugs caused Momiji to grow a "comrade" of her own that immediately got erect in the presence of Mahiro. Momiji also started to feel extremely aroused and climbed on top of Mahiro, pinning her to the ground. She apologized to Mahiro, but said that looking at her caused her body to keep growing hotter and feeling really weird. Fortunately, Momiji passed out from the heat before anything else could happen, and her "comrade" disappeared by the time she woke up as the result of the drug's effects wearing off.

Mahiro suspected that Mihari could make an improved version of it to turn Mahiro back to normal completely, but Mihari claimed she was way to busy and left the room so she wouldn't even have to consider it.

History
In "Mahiro in a Close Call", Mahiro started shivering and feeling extremely cold during the winter. Mihari explained that it was the fate of all girls, but decided to make a special drug just for Mahiro to make her feel better.

After a few days of work without rest, Mihari succeeded, and Mahiro started to feel better. She then asked Mahiro to let her rest for the day, and Mahiro agreed.

Soon after, Momiji showed up unexpectedly to hang out, and Mahiro let her inside. After Momiji started showing signs of being cold, Mahiro showed her the drug that Mihari had developed. Momiji drank some and immediately felt a warm feeling in her belly. The heat soon began to overwhelm her, and in a panic Mahiro carried her to her room to rest.

After a while, Momiji woke up, still warm, and apologized for making Mahiro worry. Mahiro told her not to worry, as it was her fault for giving her the drug. As Momiji rested in the covers, she felt something stiff below her belly, and Mahiro squeezed it. Much to Mahiro's horror, it was a "comrade", and Momiji sat up in horror. Momiji wanted to know how this happened, while Mahiro was shocked and told Momiji to count pi.

All of a sudden, Momiji grabbed Mahiro, pinned her to the ground, and climbed on top of her. As Mahiro reeled in terror, Momiji apologized, but explained that her body kept getting hotter when she looked at her and that she felt very weird. Mahiro tried to get Momiji to picture her mother's face, but Momiji continued.

Mahiro closed her eyes in terror at what would happen, but at that moment Momiji passed out from the heat.

Later, Momiji woke up, and noticed that her "comrade" had disappeared. Mahiro and Mihari played dumb, and Momiji concluded that she must've had a weird dream.

After Momiji left, Mahiro questioned Mihari on the drug, and Mihari explained what the drug actually was. Hearing this, Mahiro suggested that Mihari could use an improved variant to turn her back to normal. Mihari, not wanting to, claimed that she was too busy and walked away, despite Mahiro's protests.

Trivia

 * This drug is one of two special drugs developed by Mihari for Mahiro, the other being the Feminization Drug.