This story is a sequel to The Wizard and the Lonely Princess

Book Two of the Lonelyverse

Having returned to the Dursleys after a highly eventful first year at Hogwarts, Harry and the alicorns had been looking forward to unwinding. As it turned out, all their hopes were for nought. Between summer shenanigans, a crazy house elf, and learning Potter family history, they've got a full summer ahead of themselves. And when they get back to Hogwarts, they'll have to deal with giant snakes, idiotic teachers, and a gathering darkness. With things going off the rails, they've got a long year ahead of them.

And if they survive that, they still got to deal with the strange power surges and dreams that both Luna and Nim have been having since soon after the Summer Solstice...

Other stories in the Lonelyverse:
The Wizard and the Lonely Princess
Hooves, Plush, and Magic: The Untold Tales
The Wizard and the Lonely Princess: Hallowe'en Special
A Nightmare Christmas