You can try some popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions in various fandoms, and you're likely to find some great magnus x alec x jace ones there. Just use the search function on the site.
Another option is Tumblr. Some fans might post short fanfictions or snippets there. You can search for relevant tags like #magnus x alec x jace fanfiction. But keep in mind that Tumblr's content is more diverse and unstructured compared to dedicated fanfiction platforms, so it might take more effort to find exactly what you want.
One plot idea could be the three of them going on a dangerous magical quest together. They have to face various challenges and in the process, their relationships deepen. Maybe Magnus uses his powerful magic, Alec shows his leadership and combat skills, and Jace his quick thinking.
You can find magnus alec fanfiction on Archive of Our Own (AO3). It has a vast collection of fan - made stories about all kinds of pairings, including Magnus and Alec. Another place is Fanfiction.net, though the interface is a bit older but still has some great works.
One great 'magnus x alec fanfiction' is 'The Bond of Magic and Love'. It beautifully portrays their relationship development with well - written dialogues and vivid descriptions of their magical world. Another is 'Magnus and Alec: A Journey Together' which focuses on their adventures side by side, showing how they support each other through tough times.
Archive of Our Own (AO3) is a great place to start. It has a large collection of 'Shadowhunters' fanfiction, including many focused on Alec and Jace. You can filter by tags like their names, the type of relationship you're interested in (like friendship or parabatai bond), and more.
Fanfiction.net is also a good place to look. There are many Shadowhunters - related fanfictions there. Just use the search function to find ones that match 'Jace Hurts Alec' theme.
A major theme in magnus x alec fanfiction is the exploration of power dynamics. Magnus is a powerful warlock and Alec is a shadowhunter. How they balance their different levels of power and influence in their relationship is often explored. Also, the theme of acceptance is quite prevalent. They come from different worlds, and their journey towards accepting each other's differences is a key part of many stories. For example, in some fanfictions, Alec has to come to terms with Magnus's long life and his different magical practices.
Some Tumblr blogs are dedicated to Shadowhunters fanfiction. You can search for tags related to Magnus and Alec's kiss on Tumblr, and you might stumble upon some really good fan - made stories that are not available on the other two platforms.
You can also check out Fanfiction.net. Although it has a different layout and system compared to AO3, it still has a lot of fanfictions. Look for the relevant tags or do a keyword search for the Magnus - Alec relationship with the 'hurts' aspect.
Well, AO3 is a great resource. It has a tagging system that allows you to easily search for Alec meets Magnus fanfiction. Tumblr can also be a source. Sometimes bloggers share links or even write their own short fanfictions about the two characters meeting. Additionally, some fan - run forums may have threads dedicated to sharing and discussing such fanfictions.
I'm sorry, but I don't have specific Magnus x Alec lemon fanfiction to recommend directly. You can try searching on popular fanfiction websites like Archive of Our Own (AO3). They usually have a large collection of such stories, and you can use the search function to filter for Magnus and Alec related fanfics.