Looks pretty obviously like futanari to me — you can only really see one of Ran's hands, but it's rather unlikely that she'd be fingering herself, and as you can definitely see both of Yukari's hands…
Bodies move increasingly in sync. In a state of excitement, so fur sometimes stands up.Large undulations cease, becoming unpatterned and frequent. Entire tail gradually stiffens, fur becomes unruly.Spine arches backward, convulses as if to draw closer. Fur mats together wildly.Body and tail both slacken, fur's fullness returns.