Two hand crossbows

Had an idea for an NPC assassin that uses two hand crossbows and I need some help with the logistics of it. Would two-weapon fighting apply here? Or should I just use one crossbow with rapid reload? Your thoughts please.
One, with Rapid Reload. Fan the hammer. :)
I have a very strict set of rules for gaming around my table. Or these days, table and computer monitors. No television, radio, headphones, video games...not even guests. I spend large amounts of time preparing my games and expend vast amounts of energy to make each session the best that it can be. If players can not invest time, energy and well as respect, they can leave. That's how I feel. Update fireboy and watergirl full series. No one forces players to join my campaigns, so I owe them nothing. Of course a player can always step out when not engaged. That's fine. But I get distracted easily and that's a dangerous thing.

Just me and my wyrld.

P.S. My players are NEVER bored. True story.