Bast chuckled, and got an idea in her head. Both girls seemed to be thoroughly enjoying this sick, twisted fucking. Why not help them heighten their enjoyment? Bast, her own pussy dripping liquid gold to the floor, walked up to Lena and whispered an idea into her head. Lena heard the words of the goddess (though she wasn't aware that someone was telling her what to do), and then held up a hand.
"Wait, Bree." she said before pulling off Bree's cock.
"Wha...? What's wrong Lena? Why did you stop? Come back." Bree needed Lena. Her body ached for her, and more specifically Lena's tight snatch.
"I... I want to try something." Lena said slowly. She turned around to face her friend, tail lashing behind her and ears flicking.
"You're so beautiful Bree. I can't help myself." she said. Bree shook nervously as Lena lifted her horsecock up. For a moment she thought Lena was going to slide it into her own pussy. But Lena reach out and guided Bree's cock into her folds.
"Oh, oh! Oh god, it's... you feel so good Lena!" Bree moaned. Bree's cock rubbed against Lena's clit, now positioned at the bottom of her pussy and as big as her fist. Her hooves scuffed against the floor as Lena lifted a leg around Bree's body.
"Ahh, come on Bree. Deeper, I need more!" Lena cried before jumping up and wrapping her other leg around Bree. With her new stronger legs, Bree had no trouble support Lena, as she literally rode her cock. Lena began posting up and down on it while her penis slide between Bree's breasts.
Bree was panting as her balls felt tighter and tighter. But she wasn't cumming. Her snatch was soaking wet and as hot as a burner, but she couldn't cum. She panted and drew Lena's face closer to her own. She didn't have to pull Lena too close. Her face was pushing forward into a horse's.
Lena's nostril's were larger, and sucked in as much of the musty air in the room as she could. Her lips were thick and black, making speech difficult. Fur spread from her legs other torso, and then her chest. Lena's breasts were lost in bay fur, though her black nipples stuck out like hard pegs. They rubbed against Bree's chest, and every touch made them that much harder.
Finally, as Lena pushed down one more on Bree's cock, her face finished extending. Her thick tongue went out to and met Bree's mouth. As the two both climaxed, the explored each other's mouthes. Bree's tail swished back and forth as cum flowed from her body into Lena's. One hoof stamped against the wood floor as wave after wave of pleasure hit her.
Bast went up behind Lena, and whispered in her ears again. Lena obliged to her mistress' commands, and dismounted Bree's spent cock. It was now identical to Lena's, having transformed further while inside Lena's cunt. It was just as thick and her balls hung just as low.