Act I ends on day 11, when the students arrive. We still are in Act II (it's the longest one).
The game will have three acts, interlude and epilogue:
Act I:
Rekindling with the family and start of the first relationships.
Act II:
First students (and other ladies) arrive. Stabilization of the harem and creation of a family of choice. Everyone (optionally) is pregnant (except for one character you still haven't met, but it doesn't affect you, since you don't want pregnant sex).
Interlude:
A ~6 months time jump when the MC isn't in Newport.
Act III:
The MC returns to Newport, the last students are there. Integration of the new girls into the harem (they already integrated into the family of choice while the MC was away). Tying the last loose things.
Epilogue:
Seeing how your choices affected the final outcome for every girl.
The houses are here (red circle) approximately, in the Morro Bay area. Morro bay and Los Osos don't exist and are replaced by Newport in My Dorm's world. They are isolated houses in a secondary road.
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You can get into relationships (and pregnancy) with whoever you want and there won't be negative consequences. There will be different dialogue, but you won't block any girl because you are with another. It's a "build-your-own-canon" game.