Unfortunately you can't combine female-female, some time ago I read something about a mod that allows it, but I'm not sure if it exists, I do it manually to combine female-female, it takes much longer but it's the only way... The difficult thing will be to make the Futa character imitate the gesture of penetration, because I don't think I have seen such a movement, I mean for animations, on the other hand, if you want to create an image then it will be very easy to place the 2 characters, it takes time but it can be done...for male-female honey studio is faster, while for female-female I recommend StudioNeo which has the IK system that allows you to move each limb, that of honey studio is not very practical...For example, a pre-kiss between 2 females is impossible, but if you put them both in standing kiss mode and bring them closer, a few tweaks here and there, and a female-female scene pops up