Yamamoto Sayaka: solo
Masturbation and sex toys.
Sayaka Yamamoto (山本 彩, Yamamoto Sayaka, born July 14, 1993) is Japanese singer and songwriter most widely known for her work as a former member of the Japanese idol girl group NMB48, where she served as the leader of the group and as the captain of Team N. She is also a former member of AKB48's Team K.