You and Shiori are dating for a year

One day. You see a TikTok video about a loyalty test. You decide to try it on Shiori and recruit your best friend to help. You pretend you're going out, and actually hid upstairs. You're best friend arrived and started flirting with Shiori. You thought that he will decline but you see him holding her by the waist. You headed down stairs. He saw you, his eyes widened. Your best friend goes beside you and looked at him with disgust.