Nell looked so graceful and beautiful in her true form.  Her gorgeous upper humanoid body and her lime goat lower half looked magnificent.  Orihime watched in her Arrancar prisoner uniform as Nell trained her centaur body by galloping and jumping high and far distances.  She stared at her friend's body with awe.  She had never seen such a creature in her life.  She looked all around at her body.  From her barely covered chest to her bare belly.  Once Nell rested to take a breath, Orihime deashed over to see her friend.
"Nell, that was amazing!"  Orihime shouted.
"Yeah, you think so?" She replied.
"Mm-hmm!  By the way, considering you Arrancars can do pretty incredibly stuff like fly...I was wondering...."
"Wondering what?" Nell paused her wild panting.
"I...um...." Orihime nearly began blushing.
"Just spit it out Ori-"
"EAT ME?!?" Orihime shouted in Nell's face, nearly blowing her back on the sandy ground.
"What?" Nell asked right back.  "Eat you, why would you want me to eat you?"
"Well, you know, I've been eaten a couple times, and I'm starting to get used to the cozy walls of some other girl's belly.  But, I've never been in an Arrancar's belly!"  She smiled gleefully.
"Uh...okaaaay...sure, I guess I can keep you inside for a bit." Nell shrugged.  She grabbed Orihime by her long, skinny arms and, with more strength than she had, she lifted her up over her green haired-head.  
"Are you sure you want to go through with this?"  Nell asked, Orihime still held seven feet in the air.
Orihime began shaking.  "Y-yeah, let's do it!!"  She hollered excitedly.
"Well, okay."  Nell finally slowly began releasing Orihime head-first into the bowels of her own mouth.  Orihime slid oh-so delicately and slowly down Nel's gullet into her ever-expanding bare belly.  With just Orihime's feet left, Nell took some times shoving them inside.  But, it worked and Orihime fattened Nell up to look as if she was 9 months pregnant.
"You okay in there?" Nell burped and stared down at her large abdomen as she patted it with Orihime kicked happily.
"Yeah.  Hey, this IS alot different than human bellies."  She replied.
Then, something neither of then expected to happen happened.  Slowly, Orihime began sinking into the bottom of Nell's belly and soon went through.  Nell felt the pulsating feeling of Orihime sliding down even further, past her human half.  Orihime finally stopped inside Nell's CENTAUR belly.
"Whoa, what just happened?!" Nell gasped.
"I think I got rejected by your real belly." Came Orihime's reply.
'Ooh, this feels pretty nice.  Maybe I'll just keep her in here a bit longer than expected.'  Nell thought to herself.