insincerity - your post is very informative.
However, your post seems to concentrate on only one aspect of the relationship with an HPD - the "seduction".
t's very easy to control them - they are desperate for validation, so you dole it out in little bits to reward them falling under your control, slowly, so they don't understand quite what's happening. Once that happens, they very quickly become dependent on you for their self-worth, so you can virtually tell them what to do.
Seduction to gain control by intermittent reward and infrequent expression of love is something that would probably work with any insecure woman (or man), not just an HPD, from my experience. It can also work with a person who is not basically insecure but is going through an insecure phase in life - loss of job, marriage, family or friends, etc.
Frankly, this is something I did with my HPD, initially, and obviously it worked. However, I didn't intentionally do it to manipulate or control. I was forced to do it because I realized a few weeks into our relationship that this is what works. In many ways I kept on doing this for almost 2 years (a long time, huh) until I got burnt out, since this is not normal for me.
Fortunately, at that point, you can choose not to exercise that control - once it's established you're basically in the clear and can let more "normal" relationship dynamics evolve.
This I am not so sure about, because what you probably mean by normal might not be normal to everyone else. I don't think normal dynamics evolve at any stage. Nor does genuine caring (as normal people understand) actually happen - the caring that happens from an HPD is to keep the supply of attention and validation coming - it is a form of manipulation again.
I think, the problems that we (normals) face with an HPD relationship, are the other aspects of a relationship, besides seduction:
1. Intimacy - the normal person in a relationship would like to build true intimacy beyond the seduction and honeymoon phase. This true intimacy involves honesty, trust and the ability to become vulnerable to your partner. However, this is not possible with an unaware HPD, since bringing down the defensive walls means full exposure which is weird/frightening for an HPD. It removes the fantasy and brings in reality into the relationship, which an HPD desperately tries to avoid. Hence the relationship breaks down.
This intimacy is not about sexual intimacy. Neither is it about the mushy closeness that come from romantic expressions of love - both of which are possible with an HPD. This intimacy I am talking about is the intimacy of genuine, long-lasting and honest understanding between two partners.
2. Control - the normal person in a relationship wants to build a shared-control mechanism, not an exclusive control one. So while the HPD is busy retaining covert control via deceit, manipulation, lies, tantrums and all other forms of acting-out, the normal partner is trying to give up control and trying to create an atmosphere of collaboration. This conflict brings the relatonship down.
3. Pervasive deceit - the HPD person starts the relationship by presenting a false "good girl" mask (lets call it Mask 1) to the normal partner during the mutual idealization phase. However, when the honeymoon is over, the HPD person picks up another mask (Mask 2) that of the alternating "child-woman" and "fake-mother" which is used to manipulate the normal partner for nurturance, love and control. However, the normal person doesn't use masks - he is his normal self and so he tries to uncover his partner's mask as well - if he is intelligent he discovers that there is no normal self behind the HPD's mask. This is when he realizes that he has been deceived and will continue to be deceived. This pervasive pattern of deceit takes a toll on the relationship.
4. Continuous testing - the HPD person continuously tests her partner to make his boundaries flexible. However the normal partner doesn't do that and feels resentment over time at his boundaries being violated. This again breaks down the relationship.
5. Superficial emotions - As you rightly mentioned, an HPDs emotions are not the same as a normal's. The HPD's emotions are typically based on her introjectively projected fantasy script, not the reality outside. On the other hand, the normal's emotions are based on an integrated inner-self and the outside reality. Hence to the normal, the HPD's emotions seem over-the-top or fake - it lacks true empathy. Hence there is no genuine caring from the HPD to the normal partner - soon the normal partner experiences loneliness. The HPD is anyway a lonely person. So the relationship fails.
6. Love and ambivalence - The most important requirement for carrying forward a normal adult relationship is the ability to calm yourself and know that there will be times when your partner loves you even when there is no outward expression of love - during times of ambivalence. This an HPD can't do since it triggers her buttons of insecurity and abandonment and leads her to act out impulsively and seek attention either from the partner or from outside. She therefore constantly seeks reassurance and tests the partner - eventually torturing him to become detached and seek some solitary moment of peace in his confusion. This burns out the relationship.
7. Projection and thinking - All of us project to understand others. However there is a difference - the normal person projects his balanced feelings of essential "goodness" onto his partner, gets feedback from the outside and then adapts his inner self to react to it. The HPD person projects too but doesn't have an inner reference except a script with cardboard characters, and then their adaptation to feedback from the outside is impaired as well. So effecting a compromise and reaching a solution becomes impossible in a normal-HPD relationship. The normal is left forever projecting and hoping that his HPD partner will give up the destructive ways and become better, whereas the HPD is forever projecting the script inside their heads and trying to validate and run it. There is a clash of their goals - the normal person wants to get rid of the destructive histrionic behavior in his partner, whereas the HPD person tries to keep that behavior intact and run it according to the script.
I understand that you (since you say you are a psychopath) probably don't view it from the perspective I have mentioned above, but the fact is that most of us consciously or unconsciously do - hence our problems with an HPD relationship.
Frankly, its very easy to seduce an HPD - just provide attention during a time when she is not getting it elsewhere and she will fall for you - she is very easily suggestible. Seduction is not an issue for many of us - since the HPD is ready to be seduced anyways. A normal person or a psychopath - as long as you can supply her the attention she needs and play her fantasy script, its very easy to seduce her - she doesn't have much of a choice or taste in men anyways - you are just a cardboard character in her script and your qualities don't matter much to her. The seduction of a normal woman is actually more difficult.
Neither is manipulation of an HPD difficult - if you know her tricks, and you are willing to manipulate, you can do it too. Her manipulations are not very elaborate and complex - they are easy once you know it. And if you know your boundaries, you can easily spot them, call her for them and apply your own ones on her too.
However, once the seduction is over, if you need a "real" relationship, that's when the problem arises, because an unaware HPD is simply not capable of carrying forward an adult relationship with the kind of expectations that a normal person would have of her. Neither can a normal person continuously meet the expectations of an HPD.
For a psychopath - HPD relationship, i am assuming that some of the issues I describe above may seem irrelevant, but these seem to be the problem with a normal-HPD relationship, as I have understood from this forum, my own over 2-year relationship and elsewhere.