Mina was dizzy with anticipation as Jagger continued to pound into her.  She wasn't sure exactly<em>what</em>she was waiting for, only that it was close - oh, so close.  All of a sudden, she felt something measurably thicker - not a smooth tapering - pressing against her already-straining opening.  Her eyes flew open as she felt that impossibly stretched ring yield yet again, opening until she felt something like a ridge pass through it, followed by a sudden narrowing.<br/><br/>As her muscles swallowed the knot, the sensation started a shiver that grew into a convulsive shuddering.  The muscles that had been fluttering around Jagger's cock suddenly gripped, and her hips went into a frenzy as if trying to impale herself even further.  Her mouth formed a nearly soundless 'oh' as her first climax ever was claimed by this fantastic beast.