This is really well-written, actually. Jeez. Don't think I've seen better vore smut in my life. The characters have good dynamic, are nicely fleshed out, and the thing looks like it was actually proof-read. The animation for the dice rolling fits well and is very satisfying, and the coin flip is nice, too. The jokes are good and play off well, even giving more character, rather than being random one-offs like other short stories.
The endings are well done, and even I can acknowledge that despite not being into all of them. The side bar isn't intrusive unlike in some games, and doesn't distract from the immersion while you play. I'm excited to see more if it comes. (Pun unintended.)