The idea of introducing something that causes doubt to the players is quite interesting, even if it would make this place a nightmare(we already saw that with Fake Erynn, despite the fact that Fake Erynn gets exposed 5s later

).
And then leave to the players to either trust their LIs or get mad.
For example the person in Alexis bed can be her coworker from the bar(or any other man) or just her cousin Lakeyin who was talking to her, maybe watching a movie in her bedroom and fell asleep.
Up to each person to figure out what they believe.
Of course here the stakes are much lower because for this phone call to happen Alexis needs to be single, and therefore we have no right to say anything if she's fucking anybody, it's just a curiosity...
In the scene Nyx explained there would be real emotional stakes.