Ok, seems like I still have something to do, I'm still at friends with Lisa XD
I think I got to the point rather quick, maybe 5 times with Kira/Lisa at night. Did you get rid of her panties around the house or at least talked to her about it and more importantly: Which route did you take? Maybe it has something to with it.
More interestingly is you mentioning something about Kira/Alice at night, I thought there was only the Kate/Alice threesome for now, maybe a typo?
I don't think Eric really plays a role in your hindered progress if you took him out of the Lisa equation, but you never know. Maybe someone with more insight knowledge can answer this, I'm just a player and no analyzer.
Be my quest to share the save and I'll take a look at it, but I can't make any promises that it'll bear fruits