I currently have two female mercenarys got max affection one and a very high affection on the other of  and i see that there is a sexual favor button but for some reason i cant click it, is it because the mechanic hasn't been implemented yet or is this a bug?  (the two mercenarys in question are Enya & Akio)

Hello!

All mercenaries will get merged with the Domestic Servant Engine after the combat revamp. This will enable more advanced sexual options. There's one fuckable guard, Loren, in the 0.8.1 Alpha that goes live in a week:

https://subscribestar.adult/posts/709752