BAKE
Annabeth had many qualities, but cooking wasn't one of them. Still she was willing to spend the entire day on the kitchen, if necessary, to make Percy that surprise.
It was his birthday and she'd go to his house that night for the little reunion his mom was preparing. Sally would do all the food, of course, even because she knew the girl and the kitchen didn't really get along, but Annabeth had to manage at least that, because it would be special and probably the only thing she'd be able to find.
After many hours in the kitchen and many failed tries she found herself with a presentable blue cupcake in her hands. She smiled happy with herself and got changed to go to her boyfriend's house. Getting there she was received by Sally and Paul and headed to his room with the cupcake in her hands.
"Happy birthday." She said when she passed by the door, holding the cupcake in front of her.
He looked at her kind of surprised, but smiled when he saw she tried to remake his last birthday – that actually was when they started dating.
"Thank you." He said walking over her and kissing her lips lightly. "And happy anniversary." He added smiling.
She smiled and gave him the cupcake.
"What do you think?"
"That you're brilliant." He kept smiling, took the cupcake and bit a piece. He immediately made a grimace and let the blue cake on the table next to him. "But not a very good cook."
She was ready to complain when he caught her by the waist and kissed her again. Maybe she wasn't good at cooking, but Percy liked her anyway and that's what mattered.