More ideas could be like: Card games, or followers being able to play knucklebones with one another.
Or they could expand more on follower interactions with one another, maybe more expanding with friendship and lovers, or just add more dancing interactions with one another.
#Fun activity buildings or things for Followers to do at your Cult
eternal wren
Or possibly a tavern or bar, of some sort. Could be the place located for them to play knucklebones.
Also has an opportunity for more jobs, like a bartender.
eternal wren
This could possibly also lead to more unique quests for friends, or lovers,
Like for example lovers could experience a break-up, and a quest leads to you helping the follower move on. (Or asking for their ex to be sacrificed.)
Even then, cool little drama like this would be fun to watch, add more life to your cult.