Yeah, it will most likely be futa-dominant. The Jotun as a character isn't submissive at all. Still, having her angrily thrash around as a goblin grinds against her face could be nice.
I really love that suggestion you have for fuckable enemies though. While it would be more work for the animator, it would be possible to make them crawl towards The Jotun if she gets close. But for the sake of gameplay, I think the player should be the one to initiate H scenes. The enemy grappling/stunning you is another one of my pet peeves in h games, especially if you have to mash your entire keyboard to escape.