Not too fond about aunt and cousin, I hope they are avoidable.
The competition is a bit stupid: I think a 19-year-old would have his dick jumping high in the moment he sees the girls. They doesn't need to grind on them to make them have a boner.
The dynamic by which they get to know Jenny is perhaps dumber than Lexi's from Leap of Faith and it seems really unbelievable to me that they bring her to live with them, but there is nothing in-depth so I accept it.
In the free-roam you are forced to talk with everybody, and every talk has no choice, meaning that you make points with everyone, the only active choice so far are the peeps on aunt and cousin, looks more like a visual novel.
It's a solid prologue, but you need to divide main girls from side girls if you want to give enough space to everybody in your story.