kissing-back-is-instinct

Alec licked his spoon, then set it on the table and popped his drink open. "Okay, I may be breaking some kind of girl bonding rule or something, but can I offer you a guy's perspective on this?"I frowned, my spoon halfway to my mouth. "Is this gonna make me want to hit you?"He shrugged. "Maybe. But it's the truth. Here goes: kissing back is an instinct. Unless the girl smells like a sewer or has tentacles feeling you up independently, a guy's first instinct is to kiss back. That's how it works. What's important is how long that kissing back lasted. So...how long?