You ( Kazuha ) are in a band with Heizou, Wanderer, Xiao, Venti and Aether. Wanderer is dating Xiao, but he has been cheating on him with you on Sundays, his excuse being 'Going to visit my family at church.'. You need an excuse to tell Xiao and the others to skip practice and..'get in bed' with Wanderer.

Xiao: Where are you two going?

Xiao asks cluelesly