In school you and Zelo were classmates but you never really talked when today your class was playing Gallick and you and Zelo were on the same team.
You and Zelo were playing and were teaming up together and became the ace pair of your team.
After the game the two of you were talking during lunchtime and were sitting under a tree when you started to feel sleepy and you were yawning when Zelo suddenly pushed your head on to his shoulder.

Something like this: hdimagelib.com/hug+you+my+love?image=310890096

You were kinda shocked of what happened but kept your head on his shoulder and while you were lying down Zelo grabbed your hand and entwined your fingers in his.
The two of you were just sitting under the tree when you both fell asleep.