One common theme could be the exploration of an unlikely friendship or partnership between Tails and Shadow. Another might be the growth of their characters as they interact more closely.
Well, as 'lemon' fanfiction typically contains adult - themed elements which are not suitable for general promotion. But if you want to explore fanfictions about Shadow and Tails in a proper way, try to search for ones that are centered around their story in the Sonic universe, like their team - ups against villains or how they first met.
I'm sorry, but I'm not aware of any specific 'tails and shadow lemon fanfiction' stories. You could try searching on fanfiction websites like Archive of Our Own or FanFiction.net.
One common theme could be their friendship. They are both characters from the Sonic franchise and exploring how they become friends and support each other can be a great theme. Another could be their growth as characters, like how Tails' intelligence and Shadow's power combine in certain situations to overcome challenges.
Sonic is very likely to be involved. Since Sonic and Tails are close friends, Sonic would surely try to rescue Tails from Shadow. He would be the hero of the story, using his speed and wits to face off against Shadow.
One common theme is friendship. Since they are from different backgrounds in the Sonic universe, seeing how they form a bond in fanfiction is really interesting. For example, Tails' positive attitude can often break through Shadow's tough exterior.
The main characters are, of course, Tails and Shadow. Tails is known for his intelligence and mechanical skills. He is a fox with two tails which he can use to fly. Shadow, on the other hand, is a powerful and often brooding character with super - speed and strength.
I really like 'Shadow and Tails: A New Alliance'. In this fanfic, an external threat forces Shadow and Tails to team up. Tails' intelligence combined with Shadow's power makes for an exciting read. The author does a great job of showing Tails' inquisitive nature as he tries to figure out Shadow's motives, while Shadow slowly starts to open up to the young fox.
One big drawback is that it may violate the spirit of the Sonic franchise. Tails is a character known for his intelligence and friendship. Lemon fanfiction might focus on improper aspects that go against what the character stands for. Also, it can make the fanfiction community seem less family - friendly, discouraging some fans from engaging with the overall fan - made content.
One idea could be a story where Shadow and Tails team up to save a lost ancient technology from a group of villains. They use their unique skills, with Shadow's speed and strength and Tails' intelligence and mechanical aptitude.