Brother & Sister Enter the Forest by Richard Mirabella

Opening like a fairy tale and ending like a nightmare, this cannonball of a queer coming-of-age novel follows a young man's relationship with a violent older boyfriend—and how he and his sister survive a terrible crime
After years of severed communication, Justin appears on his sister's doorstep needing a place to stay. The home he's made for himself has collapsed, as has everything else in his life. When they were children, Willa played the role of her brother's protector, but now, afraid of the chaos he might bring, she's reluctant to let him in.
Willa lives a carefully ordered life working as a nurse and making ornate dioramas in her spare time. As Justin tries to connect with the people she's closest to—her landlord, her boyfriend, their mother—she begins to feel exposed. Willa and Justin's relationship has always been strained yet loving, frustrating and close. But it hits a new breaking point when Justin spirals...