I decided to go to my brother's house for a month when school was on summer vacation. Ai-san, who is good friends with my brother and is married to him, is also a childhood friend of my brother and I. Moreover, Ai-san had dated me in the past, so I was looking forward to seeing her again. Ai-san was as beautiful and innocent as ever, and I couldn't hold back my feelings. Ai-san felt the same way and we started making out even though our brother was right next to us. Whenever we had a chance, even for a moment, the thrill of silently playing with each other in secret...that made our relationship even hotter.