"There’s something about the first time you really care for someone." "Growing up together is my favorite story." "No matter where we go, I'm glad it's with you."

Here are a few options depending on the vibe of the photo: Sweet & Romantic "Just two kids with a whole lot of heart." "Every day is an adventure with you by my side." "You're my favorite kind of wonderful." "Making memories that we'll keep forever." Fun & Playful "We go together like fries and a milkshake." "Still crushing on you every single day." "Caught in a moment I never want to end." "Life is better when we're laughing together." Short & Simple "Young love." "Better together." "The best part of my day." Reflective

Which of these fits the of the picture you have in mind?