Title: Ginny Weasley, the Hog of Hogwarts
AU: Hogwarts starts at 18
Initial Subject: Ginny Weasley
Pairing: Ginny/Harry
Immobility cause: Weight Gain
Description: Being possessed by the diary of Tom Riddle left it's mark on Ginny. Owing to her mother's doting nature and love of cooking, Ginny quickly found herself using food to cope with her trauma, soon exceeding her brother Ron for amount eaten at meals, and rarely being seen without something sugary in her hand.
Naturally, this is reflecting in Ginny's waistline, a fact noticed both by her friends and family, who are concerned for her, and by Hogwarts' Bullies, who see it as a source of Mockery. As the girl slowly grows heavier each day, one bully decides to 'help her along', hitting her with a curse that caused her fat to increase, even without eating.
Suddenly, instead of a pound or two every day, Ginny's gaining a pound or two every hour, rapidly swelling, first beyond the limits of her clothing, and then beyond the amount the 19 year old's legs can hold. Can Ginny stop the spell and get her weight gain under control, and how big will she be by then?
Title: Luna Lovegood's conservation of mass.
AU: Hogwarts starts at 14
Initial Subject: Luna Lovegood
Pairing: Luna/Harry
Immobility cause: Breast Expansion + Shrinking
Description: Becoming a member of the 'Ministry 6' and entering into a friendship with Harry Potter (and rumours of more) is not enough to prevent the bullies of Ravenclaw hating Luna Lovegood, if anything it makes their enmity worse, and the soon decide to take the words, knocker her down to size literally.
There are several spells that can be used to shrink a person, but the spell the bullies use have two things that set it aside from all others. The first is that there's no counter curse that can quickly and easily, reverse the effects. The other is that unlike a lot of magic, this spell respects at least one law of Muggle Physics.
Which Law? Conservation of Mass; while most of the subject shrinks, the mass lost from their body is transferred to one part in particular. Which part? Well in the case of women, naturally it is the breasts. As such the morning after the curse is placed on her, Luna wakes up to find that she is a little shorter and her clothes are looser, except her Bra, which is notably tighter.
As Luna rapidly begins to shrink down, whilst her breasts swell ever bigger, Luna must work fast to try and stop the curse, but will she succeed before her ration of Body to Breasts tips in favor of her breasts? And how will she cope with the fact that there's no known way to reverse the mass reassignment, and any attempt to restore her to full size, would grow her massive mammaries as well?