Is there a guide about complexbreeding? I think I'm doing something wrong, especially stuff like increasing traits of elves and such, since they seem to only birth monsters and the only way to get more elves is with the brothel but traits don't increase.
Also can't seem to get slaves with more than 2 womb capacity
Taking 3 rules into consideration:
①Every unit beyond 50th will increase the total maintenance by a lot.
②Essence Level Increasing probability = 7% + 8%*tier -6%*(same sex parent essence level) + 5%*(different sex one), so before you can get a high-tier slave, it's quite difficult to get a high-essence slaves without high tiers, usually at most a sum of 5 essence level.
③Max concurrent conception of all races is default 1, can be increased by tentacle room + upgrading(quickly), or enough deliveries(slowly).
1, No matter you earn from selling monster or brothel, keep the total number of units below 50. Selling milk is a way to earn money as well, but it needs high essence level to increase milk quality, and enough milk capacity, anyway is not a good way to earn money in the beginning.
2, No matter how high the essence level is, high max concurrent conception is still the most useful, it can be achieved quickly through tentacle room & upgrading.
In my master-difficulty run, I invited Rena%Lena and opened the brothel first to reach the 50 unit nums, then invited Barbara so I can use the tentacle room soon.
Because of the lack of pixies,
to save my hand, there's a lot of paizuri room and lmp slave in my brothel. And a lot of goblin slaves underground to produce monsters. These two races are the cheapest with a maintenance of 40, and default goblin slaves' conception rate is 60%, good enough. Maybe lmp is enough for all usage in the beginning, but whatever, it doesn't matter.
Then in most tentacle rooms, I buy cheap slaves and drain their breast size to gain Vitality Storage(+1 per size, huge -> big -> average -> small), and in a few tantacle rooms, I consume Vitality Storage to enlarge womb size (-8 per size, All tentacle room share the value of Vitality Storage)
3, Then I invited Flora, the slaves whose breast had already been drained to size small were handed to Flora. with more and more pixies and several lmp slaves of high max concurrent conception in the brothel providing offsprings for me, now I can earn money quickly and easily (day 25).
4, Now I can persue high-tier slaves, and higher essence levels.
Lengendary Profession (Princess, Paladin) is expensive(48500 in master difficulty) and their professions is not teachable, such a master piece is unique, her offsprings own high level of essence and max concurrent conception, but cannot inherit her tier.
But whatever, I have Ovum Recover Injection prepared for her, I don't need her offsprings to be Lengendary either.
5, As for the high tiers from races, sorry I haven't go that far, no experiences.
Honestly it works even without incest. The MC just seems to auto upgrade any trait a woman has. But If you just make sure your slave has every positive stat no matter how small you can just keep impregnating your daughters to improve them all at once. Once you've gotten the debauchery machine you can then sell your daughters fully debauched and only 1 ovum down for a decent price and just rinse and repeat until the stats are where you want them. Then you have a broodmother that you can breed for almost identical slightly superior copies. Who you can use for whatever nefarious purpose you choose. It would be a nice way to make cash if tentacles didn't make cash almost a non issue. You have to REALLY overdo it with them to get the bad ending. 
