#Source: I read bog body science for fun and use textbooks meant for surgeons as references for body horror

[osterby]

Anatomy diagram time! Here's one I pulled off Wikipedia (for some reason it's ridiculously difficult to find a diagram that shows the reproductive and digestive organs in relation to one another, so we're going to just have to use several).

The big unlabeled white thing that folds to the right side of your screen is part of the intestine.

I've drawn a green circle where the belly button should be. Use that and note the shape of the figure's hips to orient yourself in re scale and position.

This one shows where the bladder is, and also shows skin and belly button so it should be good for understanding scale

The bladder is between the uterus and the skin, here's a side view

All this together should demonstrate that the uterus is very low in the abdomen and pretty small (according to wikipedia, "7.6 cm (3.0 in) long, 4.5 cm (1.8 in) broad (side to side), and 3.0 cm (1.2 in) thick:). I'm pointing out the uterus because it's bigger and more in the way in this context, but the prostate is down near the bladder in this same area on folks who have one of those.

There is also a pubic bone in front of all this. You know how a pelvis is kinda bowl shaped? The bladder and reproductive bits rest in that bowl.

So from all this, we can see that there's a whole lot going on in the lower abdomen. With the bladder, pelvic bone, and [optionally] uterus in the way, it would be hard to see a dragon dick bulging stuff out down there, and getting the bladder and other bits mashed wouldn't feel very nice except for the most specifically kinky among us.

You're not going to see a bulge from doing stuff with the normal sexy areas of the intestines or vagina with an object that can actually fit in there.

****

But, here's the whole digestive system.

That sticky-downy part in blue at the very end is the rectum, it's the part that's involved in buttsex with a realistically sized human penis and is crammed in there with the urinary and reproductive parts. There's a lot going on in that area (which is probably why a lot of people find it fun to stick stuff up there).

Look how much more room there is after it, though, and how the colon goes off to the side. The sigmoid colon is the curving part that leads into the rectum.

Lets go back to the first diagram. Note how the sigmoid colon (the horizontal portion of the white unlabeled intestine) is both above and to the side of everything else.

There isn't much else going on there. The kidneys, liver, stomach, pancreas, spleen, etc. are higher up around the top of the intestines, and all the reproductive stuff is lower. The small intestine (the ropey coiled stuff) is packed in tight behind the colon, but intestine is about all there is in this part of the abdomen.

So if you get an arm or a dragon's entire hemepenis all the way past your rectum and into your sigmoid colon, the only stuff between that fist or hemepenis and your skin is going to be the wall of the colon itself (very movable and squishy), some thin membranes that hold things in place, and a layer of muscle and fat.

A significant amount of fat would hide the movement, and particularily strong muscles won't be easy to squish and wiggle, but on your average twink? Belly bulge is realistic.

https://www.tumblr.com/olderthannetfic/765788712654225408/httpswwwtumblrcomolderthannetfic764421845841?source=share

About seeing the dick bulge through the other character's guts, that seems like it should be unrealistic, but with anal with an unrealistically gigantic dick it might be perfectly feasible.

I once found some anal fisting porn with exactly that. The one chick had half her forearm in the other's ass and was moving her hand around in there so the camera and the chick bottoming could see it. It wasn't dead center the way you see in hentai, it was off to the left because that's where the sigmoid colon curves.

--

I have to admit I have gone on pornhub to research exactly this question. I was surprised at just how many amateur videos of Bad Dragon owners demonstrate that you really can see something.