Wendy screamed in pain, on all fours as Natsu pushed his thick cock into her tight ass but the stretching of her hole wasn't where the most pain was, his hand was in the center of her back covered in crimson flames as he burned her with his magic. The smell of searing flesh only causing her to wail more as the flames roasted her back and she could feel her skin melting off from the heat of it.

"AHHHHHHH!" Wendy cried out as Natsu fucked her ass at a blistering pace, fucking her hard and fast until the feeling became too much for her to bear. "AAAAAAAAAAHHHHHH!" She screamed as she felt her body tensing up before she had the pleasure of having an orgasm unlike any she'd ever experienced. A wave of ecstasy swept over her as she came and her moans were drowned out by Natsu's harsh grunts. Moving his flaming hand to her hip, gripping it tightly, the skin melting like butter under the heat of his magic.

"Mn... M-MNN!" Wendy grunted through clenched teeth, biting down on her lip hard so she wouldn't scream as she felt Natsu's cock swell inside of her. The moment Natsu came deep into the girls bowels, he used his magic igniting his cock with his hottest flame while still hilted inside her and blasted his cum into her bowels, filling her with his seed as his orgasm washed over him.

The sensation was overwhelming to the young girl, feeling each and every spurt of semen being pumped into her, only for the pain of her insides being cooked to overwhelm the pleasure she was experiencing. Her stomach glowed red hot before flesh started to break away flames breaking through her skin, screaming as she felt herself being burned alive from the inside out. But Natsu didn't stop there, pulling his cock out of her ass and shooting another blast of cum onto her back, coating her in his seed even after he released his fire.

Natsu stood up slowly, looking down at the petite girl who lay on the ground, her ass glowing red hot with flames, her blue hair singed black in places and her skin burnt black, crackling with embers of his magic, her body a living furnace from the intense heat he'd just engulfed her in.

Natsu watched intently before the enchantments she had put into place activated and her body began to heal itself, her skin growing back in seconds and her hair regrowing as if it never turned to ash.

Wendy relished in the fact that, she was the only one who could do this for Natsu. Natsu held off his Dragon instincts when he was with Lucy, but it was hard to during his mating season. The girl laid there basking in the glory of what Natsu had done, the damage already mostly healed, all that remained was the residual heat left over from her recent abuse.

"Natsu..." Wendy sighed dreamily as she felt him lift her up in a bridal carry, he carried her away from the scorched earth to where they had set up camp for their 'training' trip.

Wendy laid in Natsu's arms, enjoying the feeling of being held, despite the burning heat of her own body. She smiled innocently at her partner, looking up at him with those pretty eyes of hers. "Thanks for the training." She giggled as Natsu gave a grin in return, the girl snuggling into his chest, both content. Wendy knew that when they got back to Magnolia, to the Guild, it would be a secret. No one else could know about what she did for Natsu. But for now, she'd enjoy this.

The two slept together that night, curled up close in the tent Natsu had set up for them. They cuddled and kissed tenderly, each enjoying the intimacy of the other.

A secret, atleast until Natsu's mating season came again and he engulfed her in his flames once more.