I do Kathryn's ass

"You want me to do what now with your Captain's ass?" I ask with a mischievous wink.

Kathryn stops jumping and stomps a foot, "Ooooohh, you know what I mean! I want you to do my ass... Ugggggghhh!" She stomps a foot again as I laugh at her reaction.

I bring my phone over and remind her not to touch it just in case. She sighs and stands beside me with her arms held behind her back. We both know she is sticking her new chest out more than necessary. With a quick glance at her perky little boobs and an adjustment of my pants I go back to her profile. Before I do anything else I check a box at the top that says "Target aware of all Customizations" before I tap on the Ass tab.

It zooms in on her small, somewhat flat butt in just her form fitting nebula tights and a list of options:

Increase size: 3 gems

Decrease size: 1 gem

Increase firmness: 3 gems

Decrease firmness: 2 gems

Increase pleasure: 8 gems

Self lubricating asshole: 90 gems

Change shape: 1-40 gems

We stare at the list and both mutter "Self lubricating asshole?" At the same time before giggling.

I tap on Increase Size and watch as the little avatar's butt expands a bit, maybe from flat to slightly padded. Like her breasts it is a noticeable but relatively minor difference. I hover my finger above the confirm purchase button before tapping it. Down to 15 gems.

"Oh! That felt weird!" Kathryn exclaims as she grabs her butt under her dress. "Like a dozen hands slapped me and a dozen hands caressed me at the same time!" She pauses. "Umm I kind of liked it. Like that felt really, REALLY, good."

She pulls up her sundress to get a better view of herself and I stare at her new little butt encased in the now more fitted tights. "So, can you do that again? How many gems is it?" She asks while wiggling her butt in my face.

I look down at Custom Girls app, "Umm, looks like the next level is only 5 gems."

She wiggles her butt at me again and grins knowing full well what she is saying, "Please can you do my butt again? Please oh Captain, my Captain! Do my butt again!"

Knowing she will take this to ridiculous levels if I don't, and I am liking her new body, I purchase the next level (down to 10 gems) and watch in amazement as her butt swells a bit to a long moan from Kathryn. "Ohhh fuuuuuck! Wow, that was like dozens and dozens of hands slapping and massaging and caressing and... and... I don't know what else but something!"

Without realizing it she spread her legs a little bit and was bent over at the waist giving me a fantastic view of her new slightly larger butt. With her sundress bunched up in her hands I could also see straight up it to her perky little breasts hanging down with her pink nipples obviously hard. I can also smell a slight whiff of arousal, like she had a little orgasm just now. If my cock could have got anymore erect it would have.

I wish I had a shot with her since she is an amazing person but we have had multiple conversations, all while staring at hot women, about how we both love women and boobs and pussy and neither of us is interested in cock.

Even though being around her can be a little sexually frustrating at times I respect Kathryn as a person and a friend so I never push her on that except for our little mutual jokes. Basically I care about her and our friendship way more than trying to bang her and how that would likely destroy our friendship. That said it doesn't stop me from peeking at her and she knows it, being a fellow pervy voyeur and exhibitionist.

She stands up and doesn't notice me staring at her breasts because she assumes I am staring at her new butt, which is also true. She wiggles it again before standing up and looking at it again, "Wow, that is amazing!" She smacks her butt with both hands, "I have a booty! Ok, so I don't have a booty, but it's nicer and not so sad. Its still a little flat though."

"One step ahead of you." I tell her as I tap on the Change Shape option. A submenu pops up with a variety of different shapes from slightly less flat for 1 gem up to an overflowing juicy booty for 40 gems. There is a note that if I change the shape the price will be deducted from any future Change Shape purchase down to a cost of a minimum of 1 gem. So I can easily give her a better butt later if I want to.

With only 10 gems I can't afford any of the larger options, not that I think a huge ass would look good on her with her narrow frame and small bust. I sort it by cost and start tapping on options. Of course the one we both think would be best is the small firm rounded butt that was described as Bubble Butt in Training and cost 10 gems.

Kathryn is looking at me with a pleading expression, knowing if I do this I can't have fun with anybody else today. I sigh and confirm the purchase, wiping out all my gems for the day as I blatantly stare at her bottom.

"Oh thank yoooooooOOOOOOOOHHHHH FUCK!" She quickly muffles her mouth as she bends over facing away from me again. I watch as her slightly plumper but still flattish butt shifts and firms up into two pert buns. With a final bounce her tights wedge themselves firmly in her crack, making her cheeks even more well defined. I really want to smack them to see how tight she is but I resist. Barely.

Kathryn finally takes her hand away from her mouth, "Oh wow! I don't even know how to describe that! It was like my whole ass was covered in hands and they all turned it to sex jelly and then it firmed up and Felt Even Better! I've never cum so hard so quickly!"

She sighs still bent over as her scent is stronger now. I take a big whiff and stare at the ass in my face. I go to adjust my pants but my hard cock slips free of my briefs through a leg hole. There is no way I can get my cock back in my underwear until it softens and it is very obviously tenting my pant leg to the side of ny crotch. There's no way I can go out before I fix it.

An oblivious Kathryn is still bent over at the waist with her ass in my face. She slowly stands up while unnecessarily sticking her butt out and arching her back. It gives me a close up view of her new butt in action with the added distraction of her perky little breasts on display too. I barely resist grabbing her and soon as she stands up she turns around to check herself out, "Damn! I actually have a nice ass now!"

She turns to look at me and then down at my crotch before dropping her sundress back into place and turning around to face me with her face flushed from orgasm and embarrassment, "Umm, sorry if that made things awkward. I don't know what came over me when things were changed."

Grinning I look pointedly at the front of her dress, "Well Captain, I think I know what came."

"Oh you little shit!" She said play punching me on the shoulder. "How about I leave you to your little problems," she looks at my crotch and mutters, "ok, maybe your bigger problems than I thought. I'm going to head back to help up front and tell everybody you're busy fixing books for a while. Looks like you might need some quality time with your Captain's Log."

She opens the door and looks back, "Thank you Captain." I salute her as she closes the door with a shake of her new butt and locks it. I slump back in my chair and set my phone on the desk. I follow her suggestion, and what I was planning on trying to do anyways.

I unzip my pants and pull them and my briefs down to my knees. My cock springs up, decently above average in length and girth. I lean back and grab my shaft when I hear a sexy sultry voice behind me, "Well isn't this interesting?"