Patrick :
for his birthday you had a photo shoot set up. he told you to do whatever pose and this one turned out the best.
Pete:
your favorite place was the water. your favorite person is Pete. so when you took Pete to your secret area at the ocean, you didn't pass up taking this picture.
Andy:
it was a long car ride. you were trying to get his attention but he wouldn't listen. he finally let you hold his hand, and you thought this would make a good lock screen so took the picture.
Joe:
you two were walking away from a basketball game, when he took this cute picture on your phone. you didn't realize it till you went to change your lockscreen, but it was great.