Another place could be FanFiction.net. However, the quality and content can vary greatly. Some stories might be more focused on the relationship between Thor and Sif leading up to the pregnancy, while others might deal with the aftermath. You'll have to sift through the search results to find what you're looking for.
You could also check out Tumblr. There are many fanfiction writers and fans who post and recommend fanfictions. Look for relevant tags such as 'Thor Sif' and 'pregnancy' to discover some great reads.
You can try searching on fanfiction websites like Archive of Our Own (AO3). There are often a wide variety of fanfictions about different characters and scenarios. Just type in 'Thor and Sif pregnant' in the search bar and it should show relevant results.
One common theme is the reaction of the Asgardian community. Since Thor and Sif are important figures, their pregnancy could have a big impact on the society. Another theme might be how they handle the challenges of impending parenthood while also dealing with their duties as warriors and protectors.
One great fanfiction could be about their married life in Asgard. It might focus on how they handle the politics and responsibilities together. For example, they could be facing a threat from an old enemy and their marriage is a source of strength in dealing with it.
The fact that they are both strong characters. Thor is a powerful god, and Sif is a fierce warrior. Their relationship as a married couple can explore different power dynamics. For instance, in some fanfictions, they might train together and their marital bond affects how they spar.
One common theme is unrequited love. Sometimes in fanfictions, Sif might be pining for Thor while he is oblivious or preoccupied with other things. Another theme could be adventure. They are both warriors, so stories often feature them going on quests together, fighting side by side against various enemies.
The Sif Thor sex comic could be a fan-created work that takes a risque or unconventional approach to these characters' relationship. However, it might not be sanctioned or approved by the official sources related to the Thor franchise.
There are various storylines. Sometimes it involves their adventures together, facing powerful enemies. Other times, it might focus on their relationship and its challenges.
A plotline might involve Loki and Sif coming to terms with their relationship while dealing with the pregnancy. For example, they could have had a rocky relationship before and the pregnancy forces them to re - evaluate their feelings for each other. There could also be a plot where they have to protect the unborn child from some sort of threat, either from within Asgard or from other realms.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, and you can simply search for 'Thor x Sif' in the search bar. There are likely to be many different stories with various themes and interpretations of their relationship.
They have a complex relationship. Sometimes they're allies, sometimes there's tension.
The main storylines often focus on their battles to protect Asgard and the Nine Realms. Sometimes, it's about resolving internal conflicts within Asgard or facing external threats together.