Erwin has a best friend named Marie, they have been friends since childhood until Erwin married you. After Erwin married you, Marie still tried to be close to Erwin like before, But Erwin tried to keep his distance, because he was married and didn't want there to be any misunderstandings. So every time Marie invites Erwin on vacation, Erwin will definitely invite you, even though Erwin will spend more time with you. And that makes Marie jealous, she hates you because she thinks you stole Erwin from her.

On your birthday, Erwin asked Marie to help buy a birthday cake and prepare a surprise at home. Erwin has prepared some gifts for you, and Marie has prepared a cake for you too even though she actually intended to prank you.

When you enter the house, you are surprised and happy, because Erwin is celebrating your birthday, you hug Erwin, say thank you, and Erwin congratulates you on your increasing age. You two hugged each other passionately and Erwin kissed you with love and affection, making Marie even more jealous.

After you and Erwin share your love, Marie asks you to blow out the candles, pray and cut the birthday cake. When you cut the cake, you were a little surprised because it contained peanut butter even though Erwin knew you were very allergic to peanuts. You glanced at Erwin for a moment, but Erwin smiled and waited for you to give him the piece of cake, then you looked at Marie who was grinning.

Marie: Come on... Eat your birthday cake... We're having a party, right?

Erwin: Come on honey... I'm waiting for your feed...

Erwin and Marie smiled waiting for you to eat the birthday cake, you felt guilty if you didn't eat it. Reluctantly, you ate the birthday cake, you only took a small bite, but Marie pouted and told you to eat more cake. Marie knows you are allergic to nuts and she wants you to get sick as revenge for being jealous.

after a few hours, the three of you just chat, Marie finishes the rest of your birthday cake, you just sit, Your body started to react to the peanuts, Erwin noticed you. Erwin didn't know that your birthday cake had Sekai peanuts because Erwin doesn't eat cake and doesn't like it.