Standing there in shock their mother was undeniably aroused, as vile as what she had just witnessed was she couldn't help but squirm with barely contained lust. Her marriage had been sexless for years now and she was at a breaking point. Panting and barely in control of her actions she walked onto the lawn and got down on her knees, pulling down her pants she began to finger herself.
Distracted as she was she only noticed Dan had approuched when he leaned down and sniffed between her legs, pushing her hand aside he began to lick her bare pussy. Moaning and too overcome with lust to stop him she fell back on her ass as her son licked away, moments later she clenched her fists as she came, juices squirting from her pussy.
As she looked up she saw Dan had stood back, his enormous member throbbing at full mast, blushing she realized the stallion was waiting for his parter, for her. No one would know if she got a bit of relief right? The stallion wasn't her son anymore. Pulling her pants fully off she got down on all fours and faced her ass toward the stallion. She reached back and gave her ample butt a slap, "well come on then!".