Actually I agree with Ava, as she's mistaking tension with conflict, unlike someone else, however there's enough psychological happening to keep the players that are into the story interested and if you are familiar with the notion of the lie, I'll try to showcase Bella's storyline in 3 acts. Act one : the lie is that she hates the MC. Reaction to the lie: MC breaks through her layers and we reach act two, where the lie is that they have to keep it secret, people find out and we reach act 3, Bella dreams of being her brother's wife but they obviously can't, they go and Bella tries wedding gowns... due to the pregnancy they get as close as possible as they can... fin...
There's no conflict as Ava said but there's emotional and personal growth ( obviously in the frame of an incest game)