I would suggest that after a few weeks, of missing his big cock, it was most like;y her that to;h him she missed his cock and she wanted him to fuck her harder and deeper this time which he was only too happy to do. They both would have been so horny and eager to pleasure each other that they that the didn't care that you could hear them. she most probably told him that she wanted you to hear how much she love been fuck by a guy that knows and has the equipment to satisfy her properly, Her gasps for breath as he entered her and her moans of pleasure were a combination of his size, her hornyness, his skill and their pure lost for each other. Her being ready for him in just 20 minutes tells me she loves fucking his big cock and that she will never say no to him, he owns her pussy and they both know it and she will always drop whatever she is doing to be his cum bucket whenever he wants her.. I'm glad you enjoy them fucking as she is going to be his for a long time to come, enjoy.