Let him play with their tits.

"Seriously though, no touching?" he mock pouted. "Come on, I kinda want to play with your boobs..."

"N-Natsu!" Levy blushed. "Bisca made it clear!"

"Yeah, don't push it buddy..." Bisca added, looking a bit irritated, though not full on pissed.

"Bisca... Submit," Natsu smirked.

Bisca blinked, before she nodded and said, "Alright, fine, you can play with them." To Levy's shock, Bisca put her hands behind her back and leaned forward, and Natsu, grinning, reached forward and started groping her as she moaned.

"Bisca, what are you doing?" Levy asked, blushing.

"Oh... This feels nice..." Bisca cooed, ignoring Levy for the moment.

"Ditto," Natsu agreed with a grin, giving her tits a squeeze. He then let Bisca pull back.

"Wow, that was fun," she grinned, panting a little, causing a nice rise and fall to her chest.

"What's gotten into you?" Levy asked Bisca.

"I dunno... You should let him do it to you too though," Bisca grinned, making a switch seem to flip in Levy's mind.

"Um... Okay," she agreed, before putting her hands behind her head, and jutting her chest out. "G-go ahead Natsu..."

"Gladly," he replied, reaching out and cupping Levy's chest. He began to toy around with her medium sized tits.

"Unh, oh..." she cooed, getting into it, pressing them into his groping hands. He spent a minute on her, ending it with a pinch and pull of her nipples. "Ah!"

Once he had finished, he pulled his hands back, making her whine a bit. "That was fun," he grinned.

"Yeah..." she panted. "Um... If you want, you can do it again, any time."

"Same goes for me," Bisca added, bouncing her breasts for emphasis.