It's a choice based game, everything is forced.

what do you mean?
the only one who can force the plot is DPC, our choices have a very relative weight
I consider it a happy ending, if in the end we can consider that there is a stable relationship, possibly not clandestine
and to make possible a happy ending with Bella there is a lot to force (by DPC).
she is about ten years older than MC, and it is the minor problem
she is married, husband and marriage need to be settled
she is a teacher, will Bella have to leave her job? will she be fired?
and this without giving weight to the thousand theories, which in any case will bring additional drama and difficulties