The dynamic between Mom Sarah had changed quite significantly. More and more I would see Sarah fucking Mom with the strap-on, each time it seemed rougher and more forceful. She would bang Mom doggy in the ass or pussy until both had cum at least twice. Leaving Mom prone on the bed, exhausted and fully spent. I would be called in to clean up the mess and sooth Mom's used cunt and/or pussy. As I performed these sessions, I would furiously wank my aching cock, cumming in my other hand and eating my cum as my only reward.
Mom would spend ages eating out Sarah's pussy. Sarah would be lying on the bed looking at her phone or reading a magazine and Mom would be busy lapping at her hairy pussy until Sarah had an earth-shattering orgasm. Then Sarah would push Mom off the bed as she'd had enough for now.
One day I finished my computer work early and could hear moans coming from the lounge. I went to see if I was needed for my clean up skills. I was somewhat shocked at what I saw, Mom was naked on all fours in the middle of the room, Sarah had her fist in Mom's pussy way past her wrist, and her other hand deep in Mom's ass. Sarah was 'boxing' each fist into Moms holes with great force and speed.
Sarah looked over at me and said "add a bit more lube to Moms holes" I was quick to squirt a good dollop of lube at both holes. Sarah then said, "Just go and face fuck your Mom for Me". I didn't need asking twice, but I was a bit apprehensive as Mom didn't often suck my cock. I kneeled in front of Mom with my 8' cock at full mast. Mom seemed to be in a trance obviously from the pulverising both her holes were getting from Sarah. I moved forward and pushed my throbbing cock into Moms gaping mouth. Sarah said, "for fuck's sake, ram that fucking cock as deep in her throat as you can!". I obeyed, matching Sarah's rhythm I assaulted Mom's mouth with the same vigour and disrespect she was showing. Mom gagged and coughed and spluttered, but my resolve was relentless, as I fucked my own mothers throat for all I was worth.