Request are from Rexplayer.

Aya (Not Shameimaru Aya from Touhou Project.)

- Once you get into the house, you noticed that it was dark. You can't see anything. However, as you tried to grab the flashlight in your bag...

- *confetti pop* The light opened to reveal Pastel*Palettes with Aya holding the birthday cake saying, "Surprise!".

- "Girls... you remembered! Thank you!" You said while smiling widely.

- Aya went to you and bring the cake with the candle was on fire.

- Once Pastel*Palettes sing "Happy Birthday To You", you blow the candle and you have make a wish and it's that your friendship with Pastel*Palettes will bond together forever.

- Aya went beside you and cuddle with you. Then, something unexpected happened. She confessed her love to you and asked you that will you be her boyfriend. You happily accepted because you also have a crush on Aya.

- You two went kissing as the other saw this and they cheered for both of you. All of you have a beautiful night as you were having some birthday feast.

Chisato (Which one? Oh, from Bang Dream.)

- "Chi-chan, where are you bringing me?" You asked her while you got blindfolded.

- "You'll find out soon. Just keep walking." said Chisato as she dragged you by holding your arms.

- Once you two reach a restaurant, you went to a table and Chi-chan allowed you to open the blindfolder.

- "Surprise!" All of the Pastel*Palettes members said as a cake that said "Happy Birthday, (Y/N)(L/N)!" was at the front of you with the candle on fire.

- Chisato went to sit beside you as you started singing "Happy Birthday To You".

- Once you blow the candle, you then start eating the fancy food that Pastel*Palettes order. Chisato did feed you some of her food and you enjoyed it.

- "(Y/N)-kun, I wuv you so much~ Let's get married soon!" She said.

- "S-Sure thing, Chi-chan." You said as you two kissed on your birthday and the others cheered for you two.

Hina (One of the best little sister for... reasons.)

- She decided to celebrate your birthday with ber big sister, Sayo since Pastel*Palettes was busy having practice for their new song. They also said that they don't have enough budget to be spent only for a person.
Hina understand this and she decided to celebrate your birthday all by herself and her big sister, Sayo who agreed on this idea.

- She messaged you to go to her house because there's something important she wanted to talk about. However, little did you know that she was planning for your birthday party.

- "Happy birthday, (Y/N)!" Hina and Sayo said when you opened their house's front door. You were surprised and feel happy because at least someone remembered your birthday.

- "Aww... Thanks, girls. I appreciate it". You said as Hina dragged you to the table and the party begin.

- The three of you spent a good time together. Having some small birthday feast, playing some games and they even told you to have a sleepover with them.

Maya

- Maya told Pastel*Palettes that today is their precious friend's birthday, (Y/N). All of them decided to make this birthday something meaningful to both (Y/N) and the girls.

- You were heading to the talent agency, where Pastel*Palettes always have their practice there. Once you reach there and enter the studio, it was dark. You thought that the girls probably taking a break from their practice.

- All of a sudden, you can hear Maya count to 3 and the lights turned on all of a sudden and unexpectedly, you saw Pastel*Palettes at the front of you while shouting "Surprise!" and holding a cake that says "Happy Birthday To (Y/N)!".

- "It was all Maya's idea for this because of you being our really good friend, (Y/N)." Aya said.

- "Aww... thank you so much, Maya. This is why I love you!" You said making her blushed from your words.

- "N-No problem, (Y/N)-kun. I love you too." Maya said as the other girls teased her.

- You did have some good birthday moments that you have with Pastel*Palettes for the rest of the day.

Eve (Even if you did spell her name backwards, it's still the same.)

- For your birthday, she decided to do it in Japanese style.

- She made you some Japanese cuisine since she learned how to cook and make one at least for you. The birthday cake remains the same except the decorations of the cream has some Japanese culture pattern like a shrine and an old castle.

- She also tried to invite the others to your birthday party, but they rejected the offer politely since they were quite busy for their upcoming concert. So, she decided to celebrate it alone with you.

- "Happy birthday, (Y/N)! May the bushido make your life longer!" Eve said when you went to the studio agency.

- "Eve-chan... thank you. You're so cute when you surprised me." You said.

- "Ehehe. It's nothing. Now, let's celebrate! I made these Japanese cooking just for you!" She said as you feel amazed by the view. There's takoyaki, sushi, tempura, tonkatsu (Really? I don't eat pork, sorry.) and many more on the table.

- She even offered some of the food and feed you. To be honest, it's quite cute actually for Eve to do so. You also did the same because why not? After both of you guys have a good feast, she kissed you at the lips.

-"(Y/N), I love you! Please be my boyfriend!" Eve said.

- "I love you too, Eve! I accept and you will be my girlfriend!" You said.

- Both of your parents and Eve's parents approved of your relationship. This is probably one of your best birthday party ever.

Hope you liked the headcannons.