So I have almost eliminated my approach anxiety and can most of the time approach girls I find attractive.

The problem is I can't tease her at all and my conversations always end up being pretty bland with no escalation. I think the problem is rooted in the fact that I am scared of offending her or something. Teasing also requires a lot of creativity and I find it hard to even think of anything to say.

Are there some lines you use that works most of the time, that I can use to warm up?