Big-breasted cousins, forced swapping & desperate fertilization sex, Misono Kazuka, Morimoto Ami, APNS-172

Kaname and Ami have been best friends since their school days, and they've made a pact to marry their boyfriends. One day, on their wedding anniversary, they go to a hot spring inn to celebrate. However, the inn owner runs away with his debts, and the inn is taken over by the yakuza...