Partly, he did it to make her squirm and the other portion was because he really liked the taste of her especially when he'd already had his way with her for a bit. There was just something in him, some primal instinct that craved that scent of having already marked his territory. Using his index fingers, he spread her a little wider for him, opening her up for his questing tongue to leisurely lap at her clit, just to be a tease. She was already very sensitive down there, why eat her out like he was starving? He'd pick up the pace soon enough, and he carefully drew her clit in his mouth, sucking ever so slightly.