Ukimori Peaches! (Patreon)

A little bit of a tweak to thier design based on internal suggestions.

 All vagina-having Ukimori, have a series of strong muscles at the entrance of the vagina.  These muscles close off the vagina to prevent unwanted penetration or to stilt over-eager males from causing them discomfort. The same muscles can also be used to squeeze more firmly around the penis of the male for increased stimulation. 

The above illustration shows a detail shot  of the vaginal opening with the muscles in a closed state and open, receptive state.

 Another quirk of anatomy due to originating as a lab created species, is that female Ukimori can rarely take the whole length of a male larger than the previously illustrated "regular" size. Usually they can take no more than to the medial ring on large or "equine" males.  The more mare-like vagina has a higher likely hood of having more depth and therefore, is more likely of taking the larger males.

Unlike thier male counterparts, the more equine genitalia is fairly common. The depth of the vagina at arousal is generally 7-11 inches. Though in rare cases, particularly with more mare-like anatomy, they may have a full depth of 16 inches.