Fics like Shake on it?

“How about this? If we aren’t married by thirty, we marry each other. We’re already best friends, we’ll just be living together. Maybe I can finally get a dog.” Kara laughed and knocked their toes together. “Okay. A pact then.” “Sure, why not. A marriage pact.” Lena wiggled her hand out of Kara’s grasp and held it out, the back of it pressing against the outside of Kara’s blanket-covered knee. “Shake on it?” Kara slipped her hand into hers and shook once in a solid pump. “Deal.”

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