It was only the first joint of their thumb they had inserted into Xavier's and the look on his face was fascinating as he tried to look unappreciative of the unexpected penetration but that soon faded in favour of a dropped jaw and a moan to signal that he found it quite pleasurable in an unfamiliar way, whether he wanted to admit it to himself or not. It was also obvious by the increased intensity and depth of his thrusts, something Robin was sure Abigail would notice and enjoy. They did after all have some experience themselves with how Abigail responded to deep, hard thrusts. It was also obvious that the married couple were both approaching their first orgasm and without giving up their grip on Xavier's testicles or pulling their thumb out of his ass Robin moved away enough to let them embrace and continue to copulate skin against skin, body pressed against body, sharing kisses on the mouth, neck and face as they liked. Meanwhile Robin watched them and pushed the rest of their thumb into Xavier in one quick thrust rather than the slow, almost gentle, penetration from before. They also tightened their grip on his testicles. I was a beautiful and most arousing sight to see them fuck like they probably had not fucked in many years, moving in almost perfect unison, both approaching orgasm quickly.<br/>"Cum now, fill up her cunt with your thick creamy cum, and you can watch me clean her up," Robin whispered after Abigail had told him she loved him and leaned in close to his other ear.