sexual tension is almost better than actually doing the deed. i will not take notes on this. I also enjoy the kinda fucked angle from a divorced dad perspective of "oh god she looks and feels so much like her mother". if you wanna be less fucked up about that you lean into him learning so much more about her as her own person (as you do, pounding your own daughter) and if you wanna be more fucked up, daddy's little girl finds out that he uses her as a replacement for her mother and is super into it. there's a lot there
YOU'RE RIGHT!!!!!!!!! getting divorced or losing your wife in some other way and forming a weird attachment to your son in response and then she transitions and you are forced to grapple with the fact that she is rapidly turning into her mother in the most beautiful ways possible. even if you aren't weird about it there's something terrifying about realizing your son is rapidly turning into the kind of woman you'd actively lust after, were you still in your college years..
and then, of course, she starts looking at you like that. you take her out for dinner one night, because she's exhausted from work or class and god forbid you cook and she orders a drink or two and then she just starts looking at you with this look that starts off demure and innocent and a little cute and then melts quickly into that loving dreamy look and she gently kicks you in the leg and gives a little huff and a 'i love you, dad,' and you have to pretend like you aren't the worst man in the world for looking at her in the way you are,