<human>: Give me a shortened version of the text

Background - I've been seeing this girl off and on for a little while now, nothing serious and I don't really expect it to ever be. It's more like a flirtatious friendship. Never sexed, playfully kissed once, I just enjoy her company, she enjoys mine(Dunno if she feels more, but I like how things are currently). When we go out, it's dinner/drinks at a nice restaurant and usually an activity afterward. Also when we go out, it's always my treat ( I don't pay out of obligation nor does she expect me to pay, she offers every time we do this. I just do it cause it's around the holidays and it's a nice gesture)

Predicament - Plans are set for Friday. Fancy sushi and ice skating are happening, aww yis. Lady friend calls today and asks if her friend can come since she just broke up with her BF and is currently a mess. Wrench + plans. I don't really care if the friend comes, but when the check comes, I see the potential for an awkward situation. Our outings are usually substantial, I don't mind since I don't get to see her very often, but adding a third to the mix would be pretty expensive (and I haven't started Christmas shopping yet). Is it in bad taste to set a "I'll cover you but not her?" Should I reschedule? Should I bite and just suck it up? Suggestions?
<bot>: Lady friend asks friend to join us for our night out. is it tacky to pay for one but not both?