Uhh, nice, believable, realistic father/daughter dialogue, and fantastic, great characters, difficult to make them better and more believable. I guess you decided to make her mom dead, as well as her husband? Hm, well, that's something i wouldn't have done - i think it would have been more exciting if they both were married , but in crisis, bored, kind of disappointed in their marriages and lives generally, and simply finding in their company first fun, some laughter and good time, and after , she founds in him a real man, more and more passionate, and sexually really good, hard lover... So we would have both cheating and incest, which is the best possible combination. But hey, it's your story, let's see where it will go. And obviously, the main thing here, is belivable , realistic build-up and most of all, good hard , visually hot sex scenes. But for now, i love, it, these first pages are great for me.
PS - I really hope you won't make her accept everything easily, right away, not to mention her beeing initiator, that would be completely wrong and not that realistic. We will hopefully see her being convinced and seduced by her father and other older man (whichever role he will be playing ,her husband's father, neighbour, former colleague, friend or relative - i personally think in-law would be the option).