I can actually see Shaughna liking Luke because she knows she needs a nice bloke and not a dick, but also she has spoken well about him before and did say she would be with him if she wasn't with Callum.
Maybe him kissing Demi made me jealous. I've had that before with a friend I went on to fancy.
Do I think it would last? Nah. But this isn't real life, so why not?