@Alyx maybe a short deck of cards? like, to make up a system, if y'all had:

- two Alyx cards
- two Kara cards
- two "whoever didn't get to yesterday" cards

...and drew a card each day until you ran out and reshuffled, then it'd be unlikely (~1/9) that either of you got more than two days in a row and impossible for either of you to get more than five.