Here are some titles that have worked for book discussion and/or readers advisory in a public library setting. But make sure they work for your audience! Good luck! It's awesome that you have an opportunity to work on this list.

fiction

De Oliveira, Eddie - Lucky
Hartinger, Brent - Geography Club; Order of the Poison Oak (sequel)
Koja, Kathe - Talk
Konigsberg, Bill - Out of the Pocket
LaRochelle, David - Absolutely, Positively Not
Levithan, David - Boy Meets Boy
Lieberman, Leanne - Gravity
Moore, Perry - Hero
Peters, Julie Anne - most of her YA titles, including Keeping You a Secret; Luna; grl2grl (a short story collection)
Sanchez, Alex - Rainbow Boys, Rainbow High, Rainbow Road (3-volume series); plus So Hard to Say.
Sloan, Brian - A Really Nice Prom Mess
St. James, James - Freak Show
Steinhofel, Andreas - The Center of the World
Winterson, Jeanette - Oranges Are Not the Only Fruit
Wittlinger, Ellen - Hard Love; Love & Lies: Marisol's Story (new sequel to Hard Love); Parrotfish
Wyeth, Sharon Dennis - Orphea Proud

nonfiction/memoir

Huegel, Kelly - GLBTQ: The Survival Guide for Queer & Questioning Teens
Levithan, David, and Billy Merrell - Full Spectrum: A New Generation of Writing about Gay, Lesbian, Bisexual, Transgender, Questioning, and Other Identities
Marcus, Eric - What If Someone I Know Is Gay? Answers to Questions About What It Means to Be Gay and Lesbian
Merrell, Billy - Talking in the Dark: A Poetry Memoir
Pardes, Bronwen - Doing It Right: Making Smart, Safe, and Satisfying Choices about Sex [yes, a more general title, but it includes a full chapter on LGBQ + a full chapter on trans -- which is kind of unique -- and sometimes it's nice to be able to give more general books to LGBTQ teens, instead of always exclusively LGBTQ-focused ones]
Rooney, Frances - Hear Me Out: True Stories of Teens Educating and Confronting Homophobia
Summer, Jane - Not the Only One: Lesbian & Gay Fiction for Teens