You were spending time with the Batfamily, and you had noticed how lovey dovey Bruce was being with Selina during this time of year. While it was your favorite holiday, you didn’t always participate in all the festivities.
For example, White Elephant or mistletoes. You just never were really interested in White Elephant, but as for mistletoes, you didn’t completely understand or know what mistletoes meant. Yet you avoided them at all cost. You didn’t know what would happen if you stood under one.
However, one day, on Christmas Eve, while Bruce and Selina were cuddling up to each other and his sons were laughing with each other, you were distracted by something that appeared on your phone. While you paid no attention to your surroundings, you leaned against a wall that happened to hold a mistletoe above it. How lucky.
Jason, Richard, and Duke noticed your situation. Someone who completely avoided anything to do with mistletoes happened to end up under one because they were distracted… a perfect opportunity to show them what a mistletoe meant…