Actually I think it becomes quite clear how the sex plot goes:
1 week in hotel quarantine: Inoda has had Asuna for blowjob, vaginal and anal sex. As the line has been crossed
Next 1 week (5-6 days) in quarantine: They will fuck like rabbits and soon run out of condoms, then
The last day in quarantine: They will fuck raw and this will be peak. This is the starting point of their no-condom sex after leaving the hotel.
1 week after quarantine: They will fuck raw literally everywhere, in Asuna' house, Inoda's room, company office, during dates like game center, karaoke room, net pub, etc.
2 weeks after quarantine: Inoda will (after he corrupts Liz and Asuna's mother more) begin to have group sex with, first Asuna and Liz, then Asuna and her mother, and finally Asuna, Asuna's mother, and Liz.
3 weeks after quarantine: Inoda will somehow persuade Asuna to allow (or beg) him to cum inside, maybe with the help of Liz and Asuna's mother (as the perks show)
4 weeks after quarantine: Inoda cums inside so much and impregnates Asuna. And this may be somewhere this game is about the end.
Remember: It's 7/12 in game and after 4 weeks it will be 8/12. It's about the time that Kirito goes to study in America. So this should be where the end comes:
End 1: Asuna uses some excuse (like she has to take care of the company business) to stay with Inoda while "pretending" to be Kirito's girlfriend, but becomes Inoda's breeding sow. They fuck while having phone videos with Kirito.
End 2: Asuna goes to America with Kirito but gives birth to Inoda's baby, and Kirito thinks it's his (1 week earlier pregnancy is hard to tell). Whether her relationship with Inoda cut off? Hard to tell. Maybe she longs for Inoda's dick in America. After a year they come back to Japan with the baby to visit Asuna's mother, and Asuna goes back home and sees Inoda fucking her mother, then she can't resist and joins in.
