Let's just imagine...

It was a quiet afternoon on a summers morning when Percy Jackson came home from a hard days work of killing Kelli the Emposa.
"Hey Annabeth," the now 18 year-old yelled to his fiancé.
"Hey Percy." She yelled back. "Come here would you?"
Shrugging it off Percy walked to the lounge room from which Annabeth's voice came.
Annabeth sat on a black suede armchair nursing a small child in her arms. It was clearly draped in an old pink baby blanket.
"Oh..." Percy began. "I didn't know you were babysitting." Annabeth giggled. "Who are we babysitting for?"
Annabeth grinned, "I'm not babysitting, Seaweed Brain."
"Oh... then where'd the baby come from?"
Annabeth rolled her eyes before she said - like it was the most obvious thing in the world, "my head, of course."

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I found one similar to this by AludigaCornflakes