After completing this game today, I have determined that the predicate for the ending lays with the scene of:
Dylan keeps Amber company while waiting for Sam:
This event is the continuation of the “chicken fight” {Amber teases Dylan and he CUMS on her pussy} event of day 17 noon.
If Dylan pushes the right buttons he’ll get to, grope her in the kitchen, finger fuck her, and Amber gives Dylan a hand job during the lunch with Sam present.
I think the story is going to end like this:
1. Dylan wants Amber not his mom. We already know that Sam wants Sophia.
2. Dylan and Sam will team up because I think Sam figures out that his mom (Amber) did something with Dylan. Dylan tells Sam that he watched Sam and Sophia through the window.
3. Dylan and Sam will devise a plan to get both their mothers to go on a date with them (Prom, Mom/Son dance, etc..) for school and will lead to an intimate evening.
4. Both sons will dance with their friend's mother and proceed to seduce them; that it leads to and grouping and kissing.
5. During the kissing Dylan will look over at his mother and tell Sophia that he enjoyed watching her with Sam just like when she was in his room.
6. Sam then tells Amber that he knows about Dylan cumming during the chicken fight and the sex they had at the dinner table.
7. Both mothers will decide to either stop this or continue and submit to the boys will and start having sex.
8. During the sex both women will start kissing each other and end up in 69 positions (Lesbian route).
9. The sons will enter their friend's mother pussy while they are eating each other in the 69 positions, allowing their cocks be only inches from their own mother's mouth. During the sex their balls are rubbing their own mothers faces and it starts to excite the ladies.
10. During the sex, both mothers will become excited by seeing their son's cocks and will end up touching their sons' cocks leading to blow jobs from their own mother.
11. The blow jobs lead to a MOMSWAP scene.
12. Both son's cum in their own mothers
13. This will lead to both mothers getting pregnant and not knowing if the father is their son or best friends' son.
Just my take on what I have seen so far playing this game for a day.