Second question, if you guys don't mind. How much content is there on the yandere route for Jen vs the romance route?
A lot for the romance route, and basically nothing for the yandere route.
She has the same problem as Lina by not having been the focus of an update for ages, and her last update basically ended after the contest, and as such she only got content added sporadically during other girls' updates
But it is cool someone is showing interest in Jennifer and Lina.
Jennifer has little content in the game

The whole path before the art contest seems to me like a romance route, after the selection there are three events per route. We have to wait for more, Jennifer will get an update after Fiona update
He really got curious about the 2 most neglected girls' in the game.

But it is nice that someone showed some interest in them and their content other than us.

At least we know Jennifer and Lina got updates focused on them coming up.
Hey guys, do we have a lot of sharing content? Or is the focus 99% on vanilla and 1% on sharing?
Early on there is basically 0%, but the latest few updates did have quite a lot of sharing options, probably in the range of 70/30 split for vanilla/solo vs sharing.
So overall the game does not have a great deal of it, but it does offer more of it than most games that allow sharing and swinging as options.