Spoiler alert: once again, we get to see a wonder of biology. When a woman cums hard, all of her reproductive system contracts, not just her vagina. What that means is that her uterus contracts, too, and sometimes a single spot of blood can be seen on her cervix (which is the gateway to the uterus). And some guys think that is very hot—proof that the woman has truly had an orgasm, and not faked it. That's what we get in this video.
But that's giving away the climax (pun intended!) of the movie, and but not the whole plot, so never fear, you'll still want to watch from start to wet finish. Silvia is spread-legged and wide opened with a speculum at the very start of this movie, with the ever-helpful Vanda assisting our photographer by helping him stay on target. Silvia is skootched forward on the couch, her yawning gape framed by black stockings, and immediately applies a small Hitachi-style vibrator to her clit. Her long slit is moist and throbbing, her wrist is trembling, and both women are smiling as Silvia's breath comes in abbreviated gasps. You can see her vagina gently spasming in pre-orgasmic pleasure as Vanda keeps the speculum aimed so that we can see all the way down Silvia's stretched vagina to her clearly lit cervix.
Silivia's breathing intensifies and her gasps turn to moans of pleasure, and she starts really moving around (and here's where Vanda's steady hand becomes very useful—not only does it help stimulate the inside of Silvia's cunt, but it stimulates us by giving as a continuous and clear show. When she does cum, you can really see Silvia's vagina grabbing at the speculum, contracting wetly around it (but thanks to Vanda, she doesn't manage to eject it, which would otherwise have happened).
One orgasm is not enough, so while we showed the first one as a full-body shot, the second one is in tight closeup (well, the closeup is tight, the focus is tight, the aim is tight, but the vagina is wet, wide open, and pulsating with pleasure :-) And there is that small red spot of proof just as she begins to cum the second time.
Listen to Silvia's startled gasp when Vanda pulls out the speculum. Then keep watching, because we get a few more finger spreads :-)