His mother is a likely sender. She could be worried about Remus and send a Howler to remind him to take his Wolfsbane Potion regularly or to be more cautious around others. Mothers are often protective, and in the wizarding world, a Howler is a rather forceful way to get your point across.
In non - lemon fanfiction, their relationship is often complex. There is usually a lot of mutual distrust at first, given Severus' association with the Slytherins and Remus being a Gryffindor. But as the story progresses, they might find common ground in their intelligence and love for magic. For example, they could bond over a difficult magical theory or a rare potion ingredient.
At first, Remus would likely be overwhelmed by all the new technology in the future. However, his academic background and inquisitive nature would help him adapt. He might start with simple things like learning how to use a magic - enhanced computer. He would be interested in how technology has changed the way wizards communicate, study magic, and live their lives. As he gets more used to it, he could even start inventing new things by combining his old - world magic with the new - age technology, creating something truly unique.
In this fanfiction, their relationship could transform in a significant way. At first, they may have been more like acquaintances or even rivals among werewolves. But with Harry in the picture, they would be forced to communicate better. Remus could influence Fenrir to be more civilized, while Fenrir could make Remus more assertive. They would share the joys and sorrows of raising Harry, which would create a bond between them that was stronger than just their werewolf connection.
He often gives her words of encouragement. For example, he might tell her that her intelligence and courage are her greatest assets and that she should trust herself more. He could also share stories from his past that are relevant to her situation, so she knows she's not the only one who has faced difficulties.
They could start by sharing their deepest secrets. Harry could tell Remus about his nightmares and fears about Voldemort, and Remus could open up about his struggles with being a werewolf. This sharing would create a strong bond between them.