Imagine seeing her at a con and she just locks eyes with you and dead serious walks up and licks your face. You stumble away, shocked by what you just experienced.
Later you see her again, but this time she's turned away from you, the nape of her neck exposed and beckoning. You quietly sneak up and give it a lick as she yelps in surprise.
As the con goes on, this becomes a game for you two, whoever catches the other unaware gets to sneak up and lick them, like some perverse game of tag. Sometimes you catch her before she manages to do anything and sometimes she catches you.
On the final day you can feel she's preparing to go out with a bang. You're trying your best to keep your wits about you, but as you're rounding a corner into a more abandoned part of the convention center a smol ball of fury pounces into your chest and bear tackles you to the ground. Before you know it she's on all fours, breathing heavily with excitement inches away from your face and just unleashes a tidal wave, completely slobbering all over you. 
Realizing you'll never be able to top that you admit defeat, telling her she's marked her territory and is free to claim you as hers.