Twilight Sparkle accidentally mistakes Bonbons new sex candy for a free sample causing a unresistable and uncontrollable urge to mate. Can Lyra and Spitfire get the little lavender filly under control or will Equestria's most powerful unicorn break them both in primal lust?

Cover used with permission from http://jungleanimal.deviantart.com/ thx jungle animal

note:side story that happens after Bonfire but before Soaring hearts in case you need a reference point.