MxF dominant tsundere with a split personality concept

This is a concept I've done quite a number of times to varying results, though I initially deleted the post with this concept as I had mainly been using this for teen characters up until now.  However, I think I've found a way to make this work with young adults as the leads.  Anyway, here's the basic setup:

An 18-year-old woman's parent/parents have just recently died.  In their will, they have requested a young man close to the family move in with the daughter and give her company.  There are just a couple of major problems with this.  For starters, the daughter is very prone to anger and will lash out violently against anyone who does anything to piss her off. (You know, like your typical tsundere) But the man could avoid angering her if not for another problem.  It seems as if after the death of her parents, she has developed another personality, one she is completely unaware of.  This one is constantly horny and wants nothing more than to get with any cute guy she sees, and the more the guy resists, the more this side of her likes it.  So a typical scenario would involve the two leads having a normal conversation only for the daughter's horny side to suddenly take over and force the guy to violate her, but just as things start to get steamy, her normal side returns, immediately gets the wrong idea and sends the guy packing.  Can the guy find a way to work around this and form a genuine bond with the woman or would he be better off bailing on her?

Now, as for the explanation behind all of this, I have a few ideas in mind.  The first idea is that the man is the son of a family friend, and therefor the parents trust him to look after their daughter after their death.  The other one I had in mind is that the woman's parents were actually divorced and it was her mother who died, therefor she felt it was finally high time the daughter met her biological brother who had been living with her father up to that point, and the daughter's tsundere-like attitude can be attributed more to an extreme bitterness she feels toward her father for divorcing her mother before she was even born, thus in turn she instinctively hates her brother and wants nothing to do with him.  This is more of an alternative as it would involve an incestuous relationship.  The less incestuous version I've tried a few times is that the mother requested this man become her adopted brother after her passing.

I even came up with another scenario connected to that first alternative choice in that the whole reason the woman's father divorced the mother is because, well, the mother was kind of a freak and the father had seen her take an unhealthy interest in younger men, even once overhearing her talk about how she wanted to bone her own son once he turned 18.  So the horny personality the daughter develops after her mother's passing is in actuality the mother's spirit trying to possess her so she can go to town on her own son, not once thinking about how much this complicates the relationship between the siblings.  And naturally, having never actually met her father or had a conversation with him, the woman is completely unaware of this, therefor it makes sense for her to resent him and her brother for the divorce.  This is more of an alternative as, well, much like the incest angle, this is very taboo, so if that idea makes you feel uncomfortable, we don't have to go through with that. (Another alternative I came up with was for the first scenario to involve the woman simply being possessed by an extremely horny ghost who used to live in the house she lives in and is looking for closure so she can finally ascend to Heaven)

So yeah, if this sounds interesting and you're up to playing a tsundere with a split personality, we can discuss this further.