OS| Two truths and a pumpkin pie by SmallSherbert| A Ronsy (Ron x Pansy) | Fanfiction Harry Potter

Summary 10 years after the war, Hogwarts alumni gather to attend
a Halloween masquerade ball but find that their festivities are
upended by none other than Hogwart's favourite poltergiest
Peeves. Bound to a magic-resistant Veritaserum whose effects only
expire at midnight, Ron does the only sensible thing he can and
runs to the farthest corner of the castle to stay out of trouble.
But trouble finds him. Find the original here:
http://archiveofourown.org/works/42819921