The glow moved over to Maria's crotch, then slowly faded.
A rather red faced Maria stammered, "W-what is this?!"
Joonas smiled with fake innocense. "What is what, Maria?"
Maria blushed deeper and lifted her skirt, showing off a thick disposable diaper. "THIS!"
"Now, now. No need to yell." Joonas was secretly enjoying every second of this.
"What happened to my panties?! I don't need to wear diapers! What's going on?!" Maria was obviously getting a little histerical.
"Call down, Maria. I can fix this."
Maria stomped her foot. "You damn well better!!"
Joonas grinned and cast another spell, Maria's crotch glowing again. After a minute or so the glow faded.
Maria looked, more like scowled, at Joonas as she growled, "I'm still in a diaper!"
"You said you didn't need to wear diapers, and I told you I could fix that, so I did."
By now Maria was quite afraid. "W-what do you..."
Maria's voice trailed off as she felt a warm spot grow on her crotch. "Wh-what...? I'm... I'm wetting myself... I can't even feel it..." Maria whimpered, standing there like a lost child.