UnderAss. Looking for someone to show me the ropes…and tie me up with them

Hi.  Welcome to Forum

I agree with with Zuz, I am afraid any differing in the avatar sizes will result in spoiling the poses already in existence.
They are the best sex poses around and have actions where many don't.
It would need every single pose and action to be readjusted to accommodate each different size.
This would be a lot of work, time consuming and probably would not be economically sound for them.

The poses where they have tried to accommodate have resulted in completely new poses such as  — the big cock ones.
You will notice the smaller breast size members wanted, as zuz pointed out, do not quite work with a fair few poses.
The hair and hats are the same. Some hair styles poke out the hats.
So, as you can see, Achat have tried but with limited success.

Maybe in the future, a pregnancy may be considered  but would require a whole set of poses and new ballooning avatars. This again, would depend on the fetish market. I'm not sure it would be a money spinner for them as yet.
But watch out if there is a tester pose. If it sells well, more will likely follow.

I know of one girl in a different game, who did a pregnancy diary and role play with her Dom, in the game forum. She and her Dom provided the text / story and pics of her avatar that were adjusted to show her advanced pregnancy state.
It worked quite well and she had a few views and followers.
That may be an option you could follow to feed your need when you meet the right partner or maybe just tell a story.

The poses in existence have an excitement bar. When this is activated by either partner, the male will ejaculate his white semen and the female squirts a yellow ejaculate – some in their play, regard this as cum or as wee, whichever goes with their play.
So enjoy your cream pies as much as you like.  Both only last a limited time and melt away, but are ready to start all over again.

Many partners enjoy rough play, just advertise it on your profile in the “Description” section,  This will attract or tell potential partners of your tastes. 
Just be aware that there are limited characters you can use and that if you contravene Achat rules or use some words they do not like, your description will revert to  “I Love Achat”
There is no known list of these words and are found by trial and error.

One I do know is words containing CAM  so  Camera ; Became ; Came; Camel, Camcorder, guacamole,  would change your whole description to ” I love Achat”
Try it, you will see. 
You may see your original line but others will see “I Love Achat.”    So you will have to ask another to check what they see.

You can also use the robots to become familiar with poses and practice smooth action/pose interchanges which is an excellent way to practice and improve experiences with VL partners.

Lastly,LOL … please read and vote on the Achat 55 word writing contest.
It can be found here . 

Adult Game AChat Forum > Organizations & Events > Contests  > Achat 55 Word Writing Contest. Halloween Stories & Poems 2020
https://funnyadultgamesplay.com/forum/index.php/topic,5168.0.html

Thanks & enjoy your game.