Lol this is crazy. How do you go back to acting normal after that? Surely Akari at that point would ask is Daichi likes her.
Obviously even the boob massages would have taken them way over the line of going back to being friends, but even if we can believe that, this goes even father. If this happened and Daichi went back to treating Akari the same way the next day she'd be really hurt
At that point you kind of need to either get together, or separate for good, or else Akari is just going to get destroyed.
How dare Daichi trample on a young maiden's heart like this by makng out and touching her like that then just acting like she's only a friend, someone to be set aside. Daichi should do the decent thing and ask Akari and Sensei to both be his women.