I went to a friend's house to play, and his older sister welcomed me, but she was in an unguarded outfit with enormous breasts, leaving me nowhere to look. Then I happened to encounter her naked in the room while changing! Seeing those enormous breasts, as a teenager, I naturally got an instant erection! No matter how much I tried to hide it, I was immediately found out! I thought she would be disgusted, but instead, his older sister seemed aroused and smirked while inviting me! Before I knew it, without my friend knowing, I secretly had sex with her！！
