That was quite good at 12 Grimmoldy place. Every witch's fantasy indeed. Reality just doesn't quite live up to expectations. I suppose it would be a bit unrealistic for Susan to climb into bed with Harry to comfort him. But having her wake him up to talk about it (maybe with some tea or chocolate) might have set the scene better for her request to see Harry's memories. Her attempt to help him deal with her nightmares would've earned the trust afdd claims is missing.