Harry Potter: Thorns and Star Trails

Multiple male leads, with the heroine in Gryffindor (each male lead gets a separate volume after second year)

James Potter spun a Quidditch Golden Snitch on his fingertip and raised an eyebrow with a teasing smile. "Wright, if you dare get distracted watching someone else during this match, I'll have to take ten points off you."

Sirius Black leaned against the common room windowsill, tapping the glass with his silver ring. "Little lion, only the Fizzing Whizzbees I give you are worthy of those sharp little canines."

Remus Lupin closed his book, moonlight climbing over the tips of his ears. "Before the library closes, would you like to hear another story about the moon?"

A faint clink of chains came from the darkness. Barty Crouch Jr. emerged from the shadows, his pale, cool fingertips brushing her flushed earlobe. The frenzied possessiveness in his eyes threatened to spill over. "Upperclassman, in the next Potions Class... could you teach me how to brew a Love Potion?" The magical shackles tightening silently inside his sleeve sent a greater shiver through her than any vow could.

Violet stroked her throbbing wand, her violet eyes reflecting faces utterly unlike one another. Beneath Hogwarts' starry sky, unknown adventures and heartbeats were quietly blossoming in a fog woven from magic and lies.