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Books that share its vibe, closest match first.

P.S. I Like You

The Charlie Method

The best laid plans

PS I Like You

Imogen, Obviously

When We Began: A Best Friend's Brother Romance

Listen to Your Heart

Sunkissed

Two Truths and a Lionel: A Witty Teen Romance About Faking Heroism, Family Legacy, and Unexpected Love

Forever ...

The Boyfriend Launcher

Doing His Best to Confess, Vol. 1