The Twins and their big Sister... With a strange smell.

As you went down into the inner lair of your cave, a scent hit your nose that was incredibly irregular. Being a great dragon such as yourself, you could differentiate all the smells that hit your nose through the thick billows of blackened smoke with ease.

And this particular scent was... Musky to say the least.

You tracked it down to the inner sanctum of your lair where the higher denizens resided. Your daughters, guardians of your treasure second only to yourself. You could also hear the growls of Winter and Crystal, your frost dragon twins, combined with the loud clap of their hips against something. On first inspection, you merely thought it was them fighting and fucking as usual.

They got their porcelain skin, red eyes, white scales and hair from their other mother, as well as her bitchy attitude, but at least were blessed with your well-endowed and toned body.

But then your heard a third groan and went a little wide eyed. It sounded like Cyra, you eldest daughter, groaning as if YOU were fucking her. You muttered to yourself, "What got in the twins today other than each other?"

Once you came upon the sight, it was as you expected. Crystal and Winter, busty and hung frost dragons of your bloodine, absolutely railing their eldest so hard, she was in her true form, a small and cute Phoenix, and was subconsciously using her Eromancy. But they weren't slowing down.

Cyra had golden feathers with her dusky skin, vibrant auburn hair and bright amber eyes. Her body may be petite with a six inch penis, but her holes are tight and heavenly, plus her mastery of pleasure magic makes sex with her mind blowing every time.

So heavenly, those two usually barely keep up with her, especially with magic. In fact, they were fucking harder than ever, Crystal absolutely stuffing her throat with her cock and Winter pounding her ass like her life depended on it, splitting her cheeks with her meat rod. Cyra's stomach is currently like a water balloon filled to the brim and she seemed as if she was about to pass out.

But that wasn't what got the most. Winter and Cyra were absolutely abnormal. Their already huge balls were swelling, their tits a cup size bigger, enough to crush your head, their horns shinier, their cock outlines bigger than usual, and their eyes were glazed over in a mix of rage and lust.

Upon this sight, a realization hit you, "Are they... On Musth?"