Together We Caught Fire by Eva V. Gibson

Lane Jamison’s life is turned upside down the week before her senior year when her father introduces her to his new fiancée: mother of Grey McIntyre, Lane’s secret, longtime crush. Now with Grey living in Lane’s house, there’s only a thin wall separating their rooms, making it harder and harder to deny their growing mutual attraction—an attraction made all the more forbidden by Grey’s long-term girlfriend Sadie Hall, who also happens to be Lane’s friend. Torn between her feelings for Grey and her friendship with Sadie—not to mention her desire to keep the peace at home—Lane befriends Sadie’s older brother, Connor… Read more.