He pulled his fingers out and lubed his cock, which was straining and hard and he moved behind her, groping her ass as he spread he cheeks wide and gently pressed the tip of his cock there.
"Gently push back and breathe out for me, love."
And as she did so, he pressed in, just long enough of the head to snap in, past all resistance,then groaned and stopped, shuddering at how tight and hot she felt.