Hi! I love the way the game developed since 0.8.4. Many suggestions and ideas have been realized since then, I think it would be a good time to focus on the game play itself, which means: to be able to repeat some quests at will, to get a permament effect for the current day.
With the new quests we could use the "boob enlargement" and "anal training" to get a proper setup for the daily brothel work. Kind of "extra training" BEFORE the girls go to her job, in order to be "prepared" as good as possible, reducing the chance or duration of getting hurt.
I personally would additional status information next to the 4 icons (throat, tits, pussy, anal). We have now "stats" which are only numbers, but you could add "real measurements" to reflect the ability to take a huge cock. (and now we have this client type) - by the way: when selecting a client, an illustration of the "size" plus measurements would be nice, too. And for the statistics, it would be funny not only to increment the "clients made cum counter", but to have an extra counter for each body part: +1 for each cumshot for the body part which was used at this moment. So you could add daily quests like "get 10 anal cumshots with Suki" or "swallow 10 times with Queen" etc.
Back to the training idea: with every BJ throat is able to take bigger cocks, same for pussy, anal. Smaller breasts can not handle boob jobs very well, so the enlargement quest could be an option. It would be nice to see the girls "grow" and change with their experience.