I don't get it why every NPC has to be romancable, like do you expect every human being to be willing to date you?
I get it, Alfira and Lacrissa are good looking women, but that doesn't mean you have any right to get them laid. What's next? Isobel and Dame Aylin? Arabella's parents?
Let us enjoy the love that those NPCs share with each other and be happy for them.
I'd say there are enough options for romance and sex in the game.