Maybe add some interactions between the various NPCs. For example, have Ann and Alice discussing what they got on the last shopping excursion or what they'd like to get on the next one. There could be a conversation between Alice and Lisa, although I don't think the two of them are ever together under the current schedule. Anyway, just small things to make it seem that the characters have lives outside of the game. I also like the simple kissing ideas already expressed.
Fix the hour where Lisa is missing in her room. Given that she is gone from the house the next hour, it could be a simple, "It looks like she's preparing to go somewhere," scene like with Alice.
Have Olivia's mom come over once a week to have coffee with Ann. They're neighbors. It'd be nice for Ann to have a friend she can just chat with. The character could be expanded later, but I think this small scene would add a lot with little effort.
Expand the Arachnophobia Opportunity. Once Max's level gets high enough with Alice, perhaps she could say that she is scared and ask Max to sleep with her. At even higher levels, after something like the Blog or Cunning Plan opportunities have reached the point of sex, perhaps she'd be willing to offer certain incentives for Max to agree.
Finally, I'll add to the chorus requesting the ability to look through the cameras. That one seems so obvious, and probably should have been added to the game a long time ago.
