Yamamoto Sayaka: bukkake
Sexual activity in which several men ejaculate on woman.
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.