Eagerly, Thundergirl craned her neck, laving his sac slowly but thoroughly with broad tongue-strokes.  After a moment, she moved in closer, sucking gently on one ball and then the other, all the while tickling with the tip of her tongue.  Meanwhile, Fera took advantage of the other girl's movement to bob her head deeper, inhaling nearly his entire length as if she just couldn't get enough of him.