The slight sting to her lip does take her focus away from his hand, though only for a few moments.

Euri feels a jolt, and suddenly she's clinging to Robin, burying her face in the crook of his neck, nails digging into his skin hard enough to draw blood.

"A - ah -" Oh god, his fingers. This is intensely intimate and while she's still obviously nervous, she's also very, very excited. If he's as good with his hands as he is at kissing....

Euri blushes heavily at the thought, and presses her lips against his neck with an aroused purr.