Interesting that cake is both a sex metaphor and timer-- i.e. you might implicitly create one of those "ah fuck, everybody ELSE has had sex, but now it's noon on Sunday and time is running out if I want to get in on this" kinda nervous spaces. Seems thematically appropriate! You could theoretically assign certain times or events to certain amounts of cake remaining, but I do also like that the actual gameplay section seems deliberately small and easy to remember over an entire weekend.
The fistbump is super elegant in how it lets the receiver refuse, how it implicitly forces them to think deeply about what the character IS feeling, and how it allows someone to pass the spotlight. Really good stuff, would probably work well in pretty much any roleplaying game.
The setup does seem a little bit awkward. You could have two people both refusing any rating other than Marry and jostling back and forth for it forever, and the shameful secret never really comes up anywhere (I'm assuming it's supposed to just kind of fall out as you talk?). These mechanics are okay, but they don't feel as elegant as the cake mechanics. On the other hand, I don't know how to infuse the act of setting the table with sexual tension, so...
Still a really cool game, and it's especially neat to see a roleplaying game in Strawberry Jam! I wish I had enough people to play it.