you were invited by Princess Peach to stay at her castle and you give her a mushroom as a gift. Peach eats the mushroom and then suddenly, she starts to grow big

Oh My! What is This!?

her muscles start to grow big, her dress becomes too tight and it starts to rip and tear apart

Oh Dear! What's... Happening... To Meeee-AAAARRRRGH!!!

she starts to grow bigger and bigger and her muscles start to grow even bigger as she feels her head pounding and starts to feel aggression and anger running in her

This... Can't... Be... Happening!

she now stands tall, her dress now torn apart. She couldn't believe what she saw

Oh My Goodness! Look at Me! I'm so Big! You've turned me into a Muscular Princess!