I don't know bout a homewrecker kink.
But I knew a single woman who targeted several married men during our friendship.
She was quite vulnerable in many ways and convinced herself that she could be a better partner to any of them than their wives could. At least two of them (I knew them) hadn't even fed her the line about not having sex/only being together for the children - in fact, they spoke openly and positively about their wives and clearly (to everyone else) weren't looking for affairs.
They were briefly flattered/amused (neither of them were the sort of men appearance wise at least who were used to women pursuing them!) by the attention but backed off when they realised she was serious and another did have a brief affair with her. I didnt know him beforehand but she did introduce me too him). Most of them had nothing to do with her. I know because I listened to the tears.
She was convinced she'd be a better partner to them because their wives were SAHMs or in low paid part time work and she was in a position of seniority at work on around £80k. She felt she could give them a life of opportunity, freedom and excitement that they couldn't have with their 'dull' unambitious wives and families. She tried buying their kids expensive gifts - red letter experience days like racing sports cars and the like that their wives couldn't have afforded and made them all sorts of promises.
The line that quite often gets touted on here of women just not doing that sort of thing always makes me smile because at least one of them does.
I haven't seen or spoken to this woman in around 5 years because eventually I realised that trying to get her to see that she was wrong, disrespectful and making a fool of herself was pointless.
The final trigger for me was her anger that the man whose children she wanted to buy a Formula 1 racing day for wouldn't let her meet his children (that's right - she hadn't even met them) and she was convinced it was because his wife was controling. After all, what sort of mother would deny her teenage sons an experience like that knowing she could never afford it herself (I seriously kid you not).
Some women (with very low self esteem, I suppose) get a kick out of believing they're able to draw a man away from his wife. That must prove something. Right?