Ha there is a subreddit for everything at this rate!Seriously there is a single subreddit for that? The internet is full of surprises.
Ohh yeah, I imagine that some of them would be eager to try out stuff like this.I know imagined Erin taking an extra time with Kyle to check if every sexual deed she read about is true or not.
Depends mainly on 3 things;How about her having belly muscles? RLD girls tend to have those.
1) how much they involuntary flex their muscles during sex.
2) how strong are their abs/belly muscles. Though you would need an almost bodybuilder type core for no bulge to show up with cocks that are 9 inches big
3) the size of the mans dick. But this part is that would enable it to be possible considering the sizes of RLD his male characters.
If the girls are basically flexing their abs/core all the time and they are a light bodybuilder at least then the bulge won't show up. But assuming they are not, and the guys are all 8 and above in length with around 5 in girth, it is very much possible with right positions and technique. Some of the biggest guys, like 10 inches, would have little problems pulling this of even in some more vanilla positions.