This is the pen name used for writing extremely adult-oriented yaoi-stories. Real names are Masaki Sano (佐野 真砂輝 Sano Masaki) and Kyou Watanabe (わたなべ 京 Watanabe Kyō).
This is the alias utilized for writing highly mature yaoi-fiction. Real names are Masaki Sano and Kyou Watanabe.