Okay, here's the completed talk. It's still rough and needs work and double/triple checking and whatnot. And of course a starting point.

It wasn't easy to sequence this one, so sorry if it's hard to follow the flow of each branch.
PC: ~Where did you get that scar?~
IF ~~ sa1scar
SAY ~Which one?~
++ ~That one on your cheek.~ + sa1scar.1
++ ~There, on your shoulder.~ + sa1scar.2
++ ~That especially nasty one on your back. Gods, how is it that you still have skin after all the punishment your back has taken?~ + sa1scar.3
++ ~That one there by your navel. It looks as though it travels toward a rather intimate region?~ + sa1scar.4
END
IF ~~ sa1scar.1
SAY ~A drunken knife fight. A half-dozen arrogant fools thought me an easy target. They were wrong.~
++ ~You sound proud of yourself.~ + sa1scar.11
++ ~So you killed or beat the hells out of men likely half your size? Congratulations.~ + sa1scar.11
++ ~Ah, the wonders of alcohol.~ + sa1scar.12
++ ~Sounds like fun.~ + sa1scar.12
END
IF ~~ sa1scar.11
SAY ~I was merely stating the facts.~
IF ~ + sa1scar.13
END
IF ~~ sa1scar.12
SAY ~The things we do to pass the time.~
IF ~ + sa1scar.13
END
IF ~~ sa1scar.13
SAY ~What of you, dear sister? Had any and fights that left their mark?~
++ ~Oh, I?ve seen my share of bar brawls. This particular fight had nothing to do with me, but I still took a dagger to the ribs. (You lift the edge of your shirt to show the faded puncture wound on your side.)~ + sa1scar.show
++ ~I have my share of scars from bar brawls and otherwise. Seems inevitable for people like us.~ + sa1scar.alike
++ ~I don?t scar.~ + sa1scar.none
++ ~Enough idle chatter. We should get some rest.~ + sa1scar.end
END
IF ~~ sa1scar.2
SAY ~One would think you?d learned to recognize your own handiwork by now.~
++ ~Oh?for what it?s worth, I?m sorry.~ + sa1scar.21
++ ~I did recognize it.~ + sa1scar.22
++ ~Sarevok, I?ve put my mark on so many people that their faces all run together in my mind. You?re no more important than any other.~ + sa1scar.22
++ ~Forget I asked.~ + sa1scar.end
END
IF ~~ sa1scar.21
SAY ~Save your pity for another.~
++ ~It?s not pity. I really am sorry.~ + sa1scar.23
++ ~Very well.~ + sa1scar.23
++ ~Sensitive subject, eh?~ + sa1scar.23
++ ~Forget I said anything.~ sa1scar.end
END
IF ~~ sa1scar.22
SAY ~Bragging?~
++ ~Yep.~ + sa1scar.23
++ ~Well?maybe just a little.~ + sa1scar.23
++ ~Not at all.~ + sa1scar.23
++ ~You know what, forget I said anything.~ + sa1scar.end
END
IF ~~ sa1scar.23
SAY ~Is there a reason you came over here to annoy me?~
++ ~Look, if it makes you feel better, you left your share of marks on me as well. Like this one. (You ease one side of your pants off your hip to reveal a long, aging scar.)~ + sa1scar.show
++ ~Perhaps it doesn?t help to hear, but you left your share of marks on me as well.~ + sa1scar.alike
++ ~If I could scar, you would have left plenty on me.~ + sa1scar.none
++ ~You?re such an ass. Forget I said anything.~ + sa1scar.end
END
IF ~~ sa1scar.3
SAY ~My foster father was not as kind as yours, dear sister. While your beloved Gorion would likely make you sit in the corner, Rieltar would have me chained and whipped for my mistakes.~
++ ~Gods?I?m sorry, Sarevok.~ + sa1scar.31
++ ~Gorion was no pushover, but I cannot imagine?it explains much about you, though.~ + sa1scar.32
++ ~Well, he?s dead now, so it doesn?t matter much anymore.~ + sa1scar.33
++ ~Hah, I?m pretty sure Gorion would say he should have taken a firmer hand with me.~ + sa1scar.34
IF ~~ sa1scar.31
SAY ~I don?t need your pity.~
++ ~It?s not pity. It?s sympathy.~ + sa1scar.34
++ ~Very well.~ + sa1scar.34
++ ~I didn?t mean to upset you.~ + sa1scar.34
++ ~Why do I bother? Forget I said anything.~ + sa1scar.end
END
IF ~~ sa1scar.32
SAY ~Does it? No, say no more. I have no desire to hear your theories.~
IF ~~ + sa1scar.34
END
IF ~~ sa1scar.33
SAY ~I?perhaps you?re right.~
IF ~~ + sa1scar.34
END
IF ~~ sa1scar.34
SAY ~Did you come over here just to compare our childhood years, then?~
++ ~My foster father may not have been a monster, but I have seen my share of torture. (You loosen the collar of your shirt and bare part of your chest, revealing only a portion of the myriad of scars you received at the hands of a certain blue-eyed mage.)~ + sa1scar.show
++ ~Although Gorion was a good man, my life has not been easy. I have seen my share of torture, and my body bears the scars just as yours does.~ + sa1scar.alike
++ ~I have seen my share - and more - of torture, though my body bears no scars, no matter how grave the wound.~ + sa1scar.none
++ ~Nevermind. Forget I said anything.~ + sa1scar.end
END
IF ~~ sa1scar.4
SAY ~Nosey wench. If you must know, an angry whore was adamant I?d shorted her on coin.~
++ ~A?whore?!~ + sa1scar.41
++ ~Sounds like you got what was coming to you.~ + sa1scar.44
++ ~Did you short her?~ + sa1scar.45
++ ~Hah! Sounds like a girl I?d get along with.~ + sa1scar.46
END
IF ~~ sa1scar.41
SAY ~Does that offend your delicate sensibilities, my dear sister?~
++ ~Of course it does! That?s disgusting!~ + sa1scar.42
++ ~A little?you never know where those women have been.~ + sa1scar.42
++ ~No, I?m just shocked that a woman who sells herself was able to outmaneuver you with a weapon.~ + sa1scar.43
++ ~I don?t want to talk about this anymore.~ + sa1scar.end
END
IF ~~ sa1scar.42
SAY ~They have their uses, believe me.~
IF ~~ + sa1scar.46
END
IF ~~ sa1scar.43
SAY ~Well?she was very limber.~
IF ~~ + sa1scar.46
END
IF ~~ sa1scar.44
SAY ~So did she.~
IF ~~ + sa1scar.46
END
IF ~~ sa1scar.45
SAY ~No.~
IF ~~ + sa1scar.46
END
IF ~~ sa1scar.46
SAY ~Why so much interest in my private affairs, <CHARNAME>?~
++ ~I certainly have my share of bedroom battle scars. (You tilt your head to the side and push your shirt off your shoulder to show him the small but deep scar.) Fell out of bed and right onto his weapon belt. Very graceful.~ + sa1scar.show
++ ~My private life has left me with my share of scars as well, not all of them physical. I daresay you understand that feeling as well.~ + sa1scar.alike
++ ~My skin does not scar, but I have my share of wounds?on the inside.~ + sa1scar.none
++ ~Interest? Enough of this. We should get some rest.~ + sa1scar.end
END
IF ~~ sa1scar.show
SAY ~(Sarevok leans in close to see the scar, near enough to feel the heat of his body. After a moment, he raises his hand to touch the mar on your skin.)
++ ~(Stay still and let him touch you.)~ + sa1scar.show2
++ ~Looking for an excuse to touch me?~ + sa1scar.show1
++ ~(Jerk away before his hand gets near.)~ + sa1scar.amused
END
IF ~~ sa1scar.show1
SAY ~Only as much as you were looking for an excuse to show me your body.~
IF ~~ + sa1scar.show2
END
IF ~~ sa1scar.show2
SAY ~(His fingers are rough and callused against your sensitive skin, but his touch is gentle as his intense eyes hold your gaze.) Careful. A sister should not look at her brother like that.~
++ ~And a brother should not touch his sister like that.~ + sa1scar.show3
++ ~Like what?~ + sa1scar.show4
++ ~(Lean closer to him, your faces only inches apart.)~ + sa1scar.show5
++ ~(Pull away from him and hastily rearrange your clothes.)~ + sa1scar.amused
END
IF ~~ sa1scar.show3
SAY ~You don?t seem to mind.~
IF ~~ + sa1scar.show5
END
IF ~~ sa1scar.show4
SAY ~Don?t play coy.~
IF ~~ sa1scar.show5
END
IF ~~ sa1scar.show5
SAY ~(There is a sense of uncertainty in his eyes, but he seems to realize something and pulls away from you.) Do not play games with me, <CHARNAME>. (With that warning, he stalks away.)~
IF ~~ EXIT
END
IF ~~ sa1scar.alike
SAY ~Ah, so you believe we have something in common then? You know nothing about me, sister.~
IF ~~ EXIT
END
IF ~~ sa1scar.none
SAY ~Your skin does not scar? Then what do you have to remind you of your mistakes? No, nevermind. Go to bed, <CHARNAME>.~
IF ~~ EXIT
END
IF ~~ sa1scar.amused
SAY ~(Sarevok looks amused and even chuckles darkly under his breath as he steps away from you.) Come, little sister. I believe it?s past your bedtime.~
IF ~~ EXIT
END
IF ~~ sa1scar.end
SAY ~Very well.~
IF ~~ EXIT
END