With that narrative, no, absolutely not.
Now try this approach.
Heather drunk and pissed at Tommy after the HOTs party goes to confront him about his last slip.
Tommy is already bussy with his +4 or repeting with his +3 (whoever she is doesn't matter for this exercise).
You would say that this is worse that your scenario, keep reading.
Heather likes Tommy, and he is a dick. Tommy was able to convince Heather into an open relationship in wich he is constantly cheating her and she keeps coming.
Is it crazy to think that Tommy turn the situation around, charm her pants out and came on top?
We know that the second girl doesn't appear in the bed in the other "timeline". The difference is warning her and giving her the drink.
This is just speculation, not a dogma. Take it with a grain of salt.