This is a pretty funny doujin. Auel and Sting find Steller sleeping and decide to wake her up and surprise her (somewhat guessing here on reasons, I don't read Japanese, the actions however are pretty self-explanetory). When they take off the covers her shirt is unbuttoned and all she has on besides that are panties. Steller seems to wake up and the two get scared, but she ignores them, grabs the sheet they removed and goes back to sleep. Auel and Sting wake Steller up and they all start having sex. The artwork isn't bad, but there are definitely a lot of better GSD doujin. There also just isn't anything really interesting that happens past that point. Slight humor, followed by sex/bj.

I say! Its a fantastic work of art. It was drawn in such a way that is would be very easy to figure out what it was all about. The qualty of the art is great. But for a GSD it could have been far better. The level of detail was acceptable, it was well balanced.
Nothing in this doujinshi said stay away. So I would gladly recommend its viewing to others ,even those who are not fans of the series.
Though I do wonder what mecha-sex would look like.