Finishing up mother/son time...

Mark blows his load into his Robin. He is panting and grinning like an idiot as he collaspes over her back. He rests there for a beat before he frees himself from her pussy.

After he pulls his pants back up, he stands his mother back. He can't help but lean in and give her deep kiss. A thank you for the doggy-style session. She looked even more naked than she really was with her red hair still in its ponytail and she still stood in her trainers. After his kiss Mark moves souths and give each of Robin's fake breasts a kiss and suck. He then redressed her. It too him a little to fit the compression shirt back on and he almost gave up a few times but it was back on her eventually.

Robin was placed back on the treadmill. Mark stepped back out in the hallway and peeked his head. He thought, "START!"

His mother stumbled on the treadmill and almost fell off. "Fuck! What the hell!" she remarked in surprised as she cut the machine off and hopped off. She then suddenly dropped to her knees and let out a long moan. She arches her back, her head leaned back facing up at the ceiling. Her eyes were closed as she breathed, Oh God..." and held her breasts. Mark could see a wet stain develop at her crotch and wondered if she pissed herself or just cum'd.