In July 1182, while his lawful wife, Masako HOJO was pregnant with his first son (MINAMOTO no Yoriie), Yoritomo invited Kame no mae to Mitsuie KOCHUTA's residence in Kotsubo (present Zushi City, Kanagawa Prefecture) and loved her.
正妻の北条政子が長男（源頼家）を妊娠中の1182年（寿永元年）6月、頼朝は亀の前を小坪(逗子市)（逗子市）の小忠太光家の宅に召して寵愛した。