Is there any appropriate 'Stormfly x Toothless' fanfiction?

No. Fanfictions about mating can often contain mature or inappropriate content that may not be suitable for younger audiences.

One common theme is friendship. Since they are both dragons in the How to Train Your Dragon series, many fanfictions will explore how they become friends and support each other. Another theme could be adventure. They might go on exciting adventures together, facing different challenges along the way.

In a fanfiction, Toothless and Stormfly might find themselves in a dangerous situation. Maybe they are trapped in a hidden cave by some hunters. While trying to escape, they have to rely on each other. Toothless uses his stealth to find a way out, and Stormfly uses her spiky tail to fend off any threats. Through this shared experience, they develop a deep bond. As they finally escape and soar into the sky, they realize they have fallen in love.

I can't really point you to 'lemon' fanfiction as it usually involves adult - themed or inappropriate content. But in general, Toothless and Stormfly fanfictions that are popular often involve their epic battles side by side or their heartwarming interactions within the dragon - vikings community of Berk.

One common theme is friendship. Since they are both dragons from different species, their friendship is often explored, like how they learn to understand and communicate with each other.

Toothless is known for being intelligent and curious. His babies might inherit this, always getting into little adventures to explore new things. Stormfly is feisty and strong - her babies could be brave and not afraid to stand up for themselves. So in a fanfiction, the Toothless babies might be the ones coming up with the ideas for exploration, while the Stormfly babies are the ones ready to fight any danger that comes their way.

One possible plot could be that the babies get lost during a big adventure. They end up in an unknown part of their world and have to learn to work together to find their way back home. Along the way, they meet new creatures and have to overcome various challenges, like crossing a big river or getting past a group of unfriendly animals.

A possible story could be about how Toothless and Stormfly's relationship evolves. Maybe they start off as just friends who are part of the same dragon group. One day, during a dangerous adventure, they have to rely on each other more than ever. This newfound closeness leads to a moment of understanding and perhaps a gentle kiss as a sign of their deepening bond.

Hiccup, Toothless's rider, would probably be quite surprised at first. But then he'd be happy for Toothless. He knows how important relationships are, and he'd see it as a sign of Toothless growing and experiencing new things. Astrid, Stormfly's rider, might be a bit more protective at first. But once she sees how much Stormfly cares for Toothless, she'd come around and support them.

Well, the story could start with Toothless and Stormfly forming a very special bond. As they have a baby, the other dragon riders would be both amazed and cautious. The baby dragon might grow up with extraordinary abilities, like being able to fly faster than both its parents or having a new type of fire - breathing power. And it would bring a whole new dynamic to the dragon - rider world in the fanfiction.