Hickory: "How does player character rub rug of Tandi?"
What the hell does that mean? What is rub rug of... ?
valdaintheking: Well the term is a strange way of saying- How does one shag Tandi? I know it lacks the regularity of how does one fuck someone but it has to do, haha
O... k... ! Well, in that case I can only assume that your question was rhetorical, or at most not serious, since you cannot romance Tandi in any way, let alone sleep with her (she's only 16 when you first meet her, by the way). She is only a temporary companion if you rescue her from the Khans, and only until you return her to Shady Sands. So, whatever your reasoning, the answer is no, it's not possible to achieve.