Sukuna does die in the manga. The way it happens is quite dramatic and ties in with many other elements of the story, adding depth and tension to the overall narrative.
The intense emotions, unexpected twists, and passionate encounters make a love story spicy. Maybe it's the forbidden aspect or the high stakes involved.
Yes, there are some out there. However, 'lemon' in fanfiction often implies adult - themed content which might not be suitable for all audiences. You can try searching on some fanfiction platforms like Archive of Our Own, but be aware of the content ratings and warnings.
Nope. Ryomen Sukuna has no basis in reality. It's a product of the creative minds of the writers and illustrators who designed a captivating fictional character for the enjoyment of the audience.
One good Yukine x Yato fanfic could be 'Bond Beyond the Gods'. It explores their relationship in a more in - depth way, showing how they grow together and understand each other better. It has great character development and interesting plot twists.