Seems like Amelia got caught up in the thrill of the act and only afterwards thought that Leon might not had enjoyed the impromptu session. Of course during blowjob she could gauge his reaction but during sex she wouldn't know if he was even watching. In past he could easily intervene but forced to keep their relationship secret complicates things. Additionally the deal was crucial to get them back home. So Amelia was afraid Leon just went along with it because of the circumstances thus making her feel guilty for enjoying it herself. It's nice to see that she is still afraid of hurting him despite how smoothly things have been going.
While I do think the reclaim scene should have been saved for arc closure, there had to be one now for her sake. With her having such doubts and the overhanging fear of losing Leon she needed reassurance that she did nothing wrong. It was a great scene.
They went with dead inside Freya instead of evil one. Such a shame. I would have preferred to see full blown evil Freya but now I just feel bad for her. Though it works better for the story to showcase what Amelia's future will be if the marriage can't be stopped. I doubt Leon will be able to go through with Geist's plan.
But by far most important thing is that: