InsaneJournal

Lucifer was having a fantastic day. He was off the spaceship for one, then they had given him spending money and after all that, he'd found an unregistered card with 1000 credits on it, which he quickly figured out how to register.

It was time to buy some new clothes. The replicator had supplemented his wardrobe but it wasn't the same as being properly fitted. So armed with his newfound wealth, he found himself inside a shop that actually appeared to sell suitable attire. Even better, he recognized two of the shoppers.

"Beckett!" Lucifer greeted Kate cheerfully, before turning to Castle and extending his hand. "And we've not been properly introduced, even if you had no qualms about shooting me repeatedly. I'm Lucifer Morningstar. I've heard a lot about you."

And just like that, Lucifer had inserted himself into Beckett and Castle's day out. He couldn't be considered a third-wheel if he felt absolutely no awkwardness about it.