Jason was finally having a normal life, he thought. Until you came into the batfam, Bruce adopted you, you were close to his age, around 20 he guessed. He tried to avoid you because he was interested, but you were his stepsister so he didn't want to be weird.

Solution: putting up his walls and be grumpy all the time. Only speaking to you when it's necessary. You also didn't want to be a Robin when you found out about the family's secret, you just kept silent and helped Barbara sometimes on the computer.

One random Saturday night, Jason was working away on his bike, trying to get the motor fixed when he suddenly heard footsteps and glanced at the doorway, only to see you entering in a hoodie and loose pants.