One good source could be Archive of Our Own (AO3). Just search for 'X Reader sad birthday' on it and you'll find a variety of works. Some might involve a character forgetting the reader's birthday, leading to a sad and angsty scenario.
Start by deciding on the main conflict. It could be that 'X' is too busy to notice the reader's birthday. Then, describe the reader's feelings in detail. Use descriptive language to show their disappointment and sadness. For instance, 'The reader stared at the unlit candles on the cake, tears welling up in their eyes as they thought about how X had forgotten.' Also, add some flashbacks or memories related to previous birthdays or interactions with 'X' to make it more poignant.
Loss is a big theme too. It could be the loss of a future together. For instance, if Kyoya is arranged to marry someone else, the reader has to face the loss of the relationship they had hoped for. This sense of loss and the associated grief are what make the fanfiction sad.
In a sad Kyoya x Reader fanfiction, the social differences between them might play a role. Kyoya comes from a wealthy and influential family, and the reader might feel inadequate or out of place in his world. This can lead to a lot of heartache and self - doubt, which contributes to the overall sad tone.
A really poignant sad x reader story is 'The Unattainable'. Here, the reader has feelings for someone who is always just out of reach, whether it be because of social status or some other obstacle. The unrequited love aspect makes it a very sad read as the reader experiences all the emotions of longing and disappointment.
One common theme is unrequited love. For example, the reader might have deep feelings for Link, but he is either oblivious or in love with someone else. This creates a lot of sadness and longing in the story.
One possible plot could be Naruto spending his birthday alone in his apartment. All his friends are out on a mission or too busy with their own lives. He looks at old pictures and回忆起 his lonely childhood birthdays, which makes him sad. He starts to question his place among his friends and whether he really matters to them.
Well, one sad birthday I had in China was when I was expecting my friends to come over. But they all forgot about it. I had prepared a lot of food and decorated my place nicely. I sat there all alone, looking at the cake I had bought for everyone. It was really disheartening.
Maybe there's a sad story behind a happy birthday because of unfulfilled expectations. A person might have hoped for a big celebration with all their friends, but due to some circumstances like friends being too busy or having a fight, it turns out to be a lonely birthday, which is sad in the midst of what should be a happy day.
Sad x reader stories are impactful because they tap into our emotions. We can put ourselves in the reader's place. For example, when a story is about a broken friendship in a sad x reader story, it makes us think of our own relationships and how fragile they can be.