Tried generating 2 girl interactions without using latent couple, controlnet or inpainting. Looks like it can work - it almost stops mixing up characters If there's enough images and they are tagged properly.
It doesn't work with current versions of HLL, but in next version it should be possible
https://litter.catbox.moe/5gcfdc.pnghttps://litter.catbox.moe/9lp4pb.pnghttps://litter.catbox.moe/qn4fgn.pnghttps://litter.catbox.moe/t57cro.pnghttps://litter.catbox.moe/wjkjuh.png