It's very unlikely that there are common themes related to such a strange and specific term. It seems more like an individual or very small - group created concept that may not have widespread thematic relevance in fanfiction.
Fanfiction has a wide variety of themes, but 'black widow feet cock' doesn't seem to be related to any of the common ones. Usually, themes in fanfiction are based on the original source material's characters, relationships, and storylines. This term doesn't seem to be related to any of those aspects in an obvious way. It could be a very unique and idiosyncratic creation that doesn't follow the normal thematic trends in fanfiction.
Given the odd nature of the term 'black widow feet cock', it's hard to imagine there being common themes associated with it. Fanfiction themes usually revolve around more general ideas like love, adventure, or power struggles. This term seems so out of the ordinary that it probably doesn't fit into the typical thematic patterns. It might be a one - off or extremely rare concept within a very specific corner of fanfiction.
One interesting fact could be that in some stories, the black widow's feet are extremely sensitive. This sensitivity allows them to detect the slightest movement in their webs, which is crucial for hunting. When an insect gets trapped, the vibrations are picked up by their feet.
One common theme is redemption. Since Natasha has a dark past, many fanfictions explore her journey towards making up for the things she's done. For example, she might try to save people she once targeted.
One common theme is female empowerment. Both Black Widow and Quake are strong female characters, and in fanfiction, they often show their strength in various situations, like fighting against powerful enemies or standing up for what they believe in.
One common theme is survival. Since it involves a quake, Black Widow often has to survive in a chaotic and dangerous environment. Another theme is heroism, as she uses her skills to help others during the quake.
Another theme is the exploration of Black Widow's past. Maybe she had a history with ballet before becoming an assassin, and the fanfiction delves into how that past resurfaces. For example, she might use ballet to cope with her traumatic memories or as a way to remember a more innocent time in her life. It's a way to add more depth to her character.
One common theme is the clash of their different worlds. Loki, being from Asgard with his magic and complex family history, and Black Widow, a product of the brutal Red Room training. Their different backgrounds often lead to interesting dynamics.
One common theme is the exploration of their different worlds. Thor from Asgard and Black Widow from Earth. Writers often use this to create interesting cultural clashes and exchanges.
The theme of adapting to new environments is also quite common. Black Widow has to adapt to the strange and magical world of Inuyasha, and Inuyasha may have to deal with the high - tech and complex world of the Marvel universe if the story goes that way. This can create some interesting situations, like Black Widow trying to figure out how to use Inuyasha's sword or Inuyasha trying to understand modern technology like Black Widow's gadgets.
One common theme is the power struggle. The vampire and the black widow both have their own forms of power, and often in these fanfictions, they clash or collaborate based on that power. Another theme is the idea of the outsider. Both characters can be seen as outsiders in different ways, and their journey to find a place in a world that doesn't fully understand them is often explored.
The theme of loyalty also comes up frequently. Whether it's loyalty to the Red Room in her past, or her newfound loyalty to the Avengers later on. Fanfictions play around with how these loyalties shift and develop over time, especially when looking at her past experiences.