When Riley hits a girls worst month. (period)
The emotions don't know how to cope with her constant body changes and sudden urges for some emotions to over take the control panel at the worst times.

Eventually Joy and the others figure out it's Riley's transformation into a woman (slow I must say)

"WARNING PUBERTY ALERT" An alarm went off inside the headquarters. Joy studied the flashing symbol curiously. "What's a puberty?"

She said aloud.

Riley was sleeping soundly in her bed, when a sudden force got her awake.

Joy began looking as the alarm started flashing a darker crimson colour.

"Extraction in progress" a voice said aloud.

Joy looked around at the room noticing it getting strange.

Suddenly she winced in pain as her entire body went red.

"Wh-what's happening to Riley" Joy muttered sore.

Anger and the others were immediately woken up. "Okay that's it! Where's that girl" Anger stomped past to check on Riley's status.

Suddenly a wave of pressure washed upon the headquarters making everyone wince in pain.

Fear panicked. "Wh-what's going on?! are we having a nightmare?!" He said.

Disgust frowned. "Ewwwwww Do you guys feel that?" She asked the others.

She shivered. "Is it just me or do we feel... Wet?" She grimaced.

Fear's eyes went wide as he frantically went through all worst case scenarios again.

Joy rolled her eyes. "I'm sure it's probably just sweat..."

Sadness winced at Joy looking pointing at the now wide awake Riley. "Umm guys you might wanna see this"

Riley woke up holding her stomach in pain. She flipped over the blanket, to her disgust was a patch a red all over her PJ pants and the sheets.

Disgust stared at the scene in horror.

Joy looked dumbfounded.

Sadness looked shocked.

Fear was already ready to faint.

Anger looked irritatingly horrified.

Fear got up immediately. "OMG WE'RE BLEEDING! WE'RE GONNA DIE!" He panicked as Joy curiously pressed a button.

Riley looked shocked. She was horrified to find her sheets and pants covered in blood.

Joy bit her lip. "Okay let's get mom over here" she said after clicking another button.

"Mom!" Riley called out.

Riley's mother immediately ran in worried. "Riley what's wrong?" She asked looking at her daughter.

Riley looked down to her stained clothes.

Riley's mother verbally relaxed and even smiled, Anger was utterly perplexed. "She's just gonna smile at our embarrassment?!" He snapped.

Joy shushed him.

Meanwhile inside the mothers brain.

All the mothers emotions shot up in awe. "Our little girl is becoming a woman!" The purple emotion shrieked in joy.

The blue emotion looked at the rest of them hugging them all tightly while balloons and fireworks went off inside the headquarters.

"Riley!" The mother gasped happily.

"Do you know what this means?" She asked.

Sadness took the steering.

Riley looked at her pants in sadness. "Yeah I gotta get new PJ's"

The mother laughed. "It means you're becoming a woman!"

Anger looked at her in frustrated disbelief. "Thanks MOM!" he said sarcastically.

Fear gulped. "Wh-what?"

Joy jumped up: "Oh this is great!"

Sadness turned her head confused. "Oh..."

Disgust blinked shocked. "WHAT?!"

Riley looked at her mother as her brain had literal mixed emotions.

Joy, Sadness, Disgust, Anger and Fear all fought over who should be taking over in this situation.

The pain kept getting anger snappy.

The confusion kept getting sadness and fear active.

The sight kept getting disgust up and complaining.

And the small amount of interest got Joy up for a few seconds.