Be attractive and passionate, laugh a lot in their presence, talk about the "deep stuff" in life and observations you have made about people and human interactions, seem a bit unsure of yourself in certain areas where the LSI would be glad to help.
In short: Make them "feel" something.
If you are able to evoke any kind of stronger emotion in them, may it be joy or even negative emotions, they won't be able to get you out of their minds.