During the month-long summer break from school, I decided to go visit my brother's house. Ai, who is very close to my brother and married him, is also a childhood friend of my brother and me. What's more, Ai used to date me, so I was looking forward to meeting her again. She was as beautiful and innocent as ever, and I couldn't contain my feelings. Ai felt the same way, so we started to get cozy even though my brother was right next to us. If there was even a moment of opportunity, the thrill of hushing up and secretly teasing each other... made our relationship even hotter.