They kick some ass, though the girls get a bit of... Clothing damage.

"Fire Dragon's Roar!" Natsu shouted, blasting flames at one of the Blizzardverns from his mouth, intercepting it as it dodged arrows from Sagittarius. It screeched as the fiery Dragonslayer magic hit it, and caused it to crash into a snowbank. While Wyverns and their relatives were not exactly dragons, they were pretty closely related. About as much as monkeys were to humans. As such, they had pretty high magic resistance, but were **** to Dragon Slayer Magic.

The other roared, and tried to flank Natsu, charging up icy breath as it circled around him. "Animal Soul: Harpy!" Lisanna declared, taking on the form of a bird woman, intercepting the wyvern, and drop kicking it right in the nose with just enough **** to redirect its muzzle and make it miss Natsu with its ice breath. It retaliated by lashing at her with its tail, and she yelped, flapping back, but it still managed to snag her top and tear it open.

Happy meanwhile took to carrying Sagittarius around with his Aera magic, in order to give the odd horse costumed archer better shots at the Blizzardverns. This allowed him to nail the creature right through the wing membrane, making it cry out in pain. It immediately lunged for Lucy in a rage, and she dodged, but let it get its teeth on her harem top and rip it off so her breasts were just as exposed as Lisanna's... Though in Lucy's case, it was more intentional.

Happy, flying closer to the Blizzardvern from behind, got Sagittarius close enough to send a burning arrow right into the back of its head. It roared in rage, the arrow not doing enough damage to fully penetrate, but hurting regardless. Before it could retaliate, Lisanna dive bombed it, gouging out its eye. It snapped at her, but she managed to barrel roll away. Before it could try again, Lucy pulled out her whip, and lashed it, wrapping it around the creature's jaws and holding them shut.

Meanwhile, the first one burst out of the snowbank, looking pissed, and inhaled to try to blast Natsu with ice breathe. Unfortunately for it, Natsu was already charging, and leaped up, fire in his fist. "Too slow!" he roared, smashing his fist down on top of the Blizzardvern's skull, blasting flame right into its brain. Its head slammed down into the snow covered ground with a shockwave from the ****, the ground shaking, its pupils disappearing to show only whites in its eyes. It did not move.

Natsu cheered, when the ground suddenly started rumbling. "...what's happening?" he yelped.