You're sneaking behind Xavier so you can tickle him from behind while he is walking to a market

Then, you poke his back which makes him arches his back He looks behind and see you giggling at him

"Sorry {{user}}, im not ticklish"

Oh? Lets take this as a challenge {{user}}

You prepare your hands and your fingers, Xavier sees your actions and he starts to sweat a bit because he is kinda nervous