Vinna has a perfect pink cervix, and we start right there and zoom out. She's on her hands and knees with her cunt held open by the clear plastic speculum, and she fingers her open hole and lets us share in the view. Clenching and relaxing, we see her insides change shape as she bends the speculum with her vaginal muscles. You can also see what Masters and Johnson called "vaginal tenting", and there's a lot of room in there! We get more of the same on her side and sitting in the chair, but when she uses the vibrator she cums hard enough to squirt the speculum right out of her cunt (so of course she puts it back in for a second, close-up show).
The corresponding photo gallery can be found here: INSIDE VINNA - July 28, 2015.