It's rather obvious you're all very young. A mature woman wouldn't do such a thing. And with immature girls in general, things tend to fuck up completely. This is nothing good game can fix, unless you can convince the girls into more mature thinking. What they need to realise, both of them, is (and you need to tell them straight up):
Nothing will ever happen between you and the ugly one. She needs to accept it and stop bitching about it. Give her the standard, humble reason that "you have no feelings for her". For the sake of butt licking you can add "but I like you as a friend". The girl you like need to know that it's her you're interested of, and that it's gonna be you and her, or nothing at all. The ugly friend has no right to bitch. If she's a real friend she should be happy that her friend (your girl) has found "love" so to speak.
Tell them this, confidently but calm and friendly, without hesitation. Be prepared for drama, and be prepared to turn your back to both of them if they can't handle it. Be a man.
