I bet this was Chiyoda's idea, she apparently has some sort of fetish for replicating Chitose's intimate experiences to become closer to her.
Updated
Uuuu.... it feels... good...Chitose's tits are soft~...Aahhhh~ Chitose, your pussy feels so good... what about you? Do you feel good, too, Chitose?Uuu... Chitose-onee...