Sunbeam Lair from what i understand

The sister’s shared excitement fremeted within them in different way. Shiori, whose happiness exploded like a fierce firework, bounded in her excitement as the ideal of playing came about. Kaori’s excitement resonated differently. It churned within, causing her heart to race and for a sense of giddiness to bubble at her lips.

Slowly, she came to a stand in response, smiling at her sister. Though she wished not to fight, she would watch on with a drumming heart and see how her sister would react.