Add to that 3469 containers with thier cosmetics in both batrooms, constant question about seeing those and fighting over thier favourite TV shows.Speaking of kissing, that'd be a nice addition to interacting with the girls.
Another nice addition would be for them to spend the night more often and waking up with them (I'm looking at you and your fine ass here, Lyriel. Stop disappearing!). And if you wanted to add more "realism" you could have them hog the blankets, take 3/4 of the bed space (minimum), and shove their freezing fucking cold feet into the MC's lower back as added "night time" events for more filler.
Probably something along the lines of "How... perverted! How could they do... do the thing! In his... bed! How filthy they are! Now I'll have to... clean this in the morning! How could they... do this... without me!"And instead of only having the morning visits "I wanna clear your room" every other day you get the night visits "I wanna dirty your room", too? Well, at least that cycle would be self-sufficient. Only need to see what Lyriel says when she sees Cait in your bed
To be honest, with the Walking Horny Generator inside the house and the amount of smut Cait and Lyriel are reading I am quite suprised we do not have threesomes on daily basis.