So for a few ideas, maybe you can write about the Weasley twins maing Harry wear a plug through out the day, torruring Harry by making him cum many times. Or give Harry to the wining quidditch team or maybe Harry gets taken by one of the teams after practice. For some humiliation and word play, someone can write degrading terms on Harry's body that cannot be normally washed off (can only wash off with someone esles cum/fluids) and are charmed to glow or gliter. When Harry does his last-fuck of the day, the orther person can take Harry's clothes, forcing him to walk naked through the school and maybe Snape finds him, this can be right after Harry get degring terms writen on him for Snape to see, so Snape charms the words.
Have funs with these ideas, change them to fit whatever you want!
FAN!~
Fenrir/Harry
please
Update soon?
Also, maybe he could be left in the Room of Requirement for one full with an invitation to everyone who would like to luck him to do so, using the Room for their needs.
This probably sounds weird, but yup.