It's Erza!

"...well, color me surprised," Erza remarked, getting up from her seat and approaching Natsu with some amusement. "I didn't realize you had it in you to do a Quest without property damage..."

"Again, he started an avalanche, we were just able to stop it," Lucy replied with amusement, and Natsu pouted at her, crossing his arms.

"Yeah, but I made the wish to prevent it from hitting the farming village," he grumbled.

"It's still Lucy's magic though," Happy sniggered.

"...even so, the fact that it's even possible is quite frankly amazing," Erza sniggered. "How did you make the wish sexual, anyway?" she then asked in an undertone.

"He wished that one of the fellow female Guild members most willing would give him a sexual reward for pulling it off," Lucy replied.

"...huh. Well, that certainly explains why the idea of taking him back to his cabin and doing some things with him popped into my head," Erza replied, clearly not against the idea, before grabbing Natsu by the scarf and ignoring his surprised protests as she dragged him out of the Guild Hall.

"... not sure whether to call him a lucky bastard, or pity him," one of the Fairy Tail guys remarked. Lucy and Lisanna laughed at that, and followed after Natsu and Erza, Lucy trying to get Lisanna to place a bet on what sexual favor Erza would be doing for Natsu, but Lisanna refusing, not willing to lose another bet with Lucy.

"Pussy," Happy teased Lisanna once Lucy pouted and gave up.

"...look who's talking, cat," Lisanna deadpanned at him.

"Hey, I'm actually a cat, that title does not apply to me in the same way," Happy stuck his tongue out.