That doesn't work, too. Feeded both a special pastry, still no threesome dialogue option.
Seems like a lot of people have the same problem, now also
DragonFire ...
If Tinkerer made such an effort to produce that many variants of the threesome, it's quite a shame that so many people don't see it in their game after the first threesome has happened. It should also be mentioned in the walkthrough, how to repeat that, but it isn't.
So, I'm not a supporter of Tinkerer, but if I was, I think that's more than enough evidence worth reporting, that obviously a lot of people have problems with repeating that threesome scene and can't trigger it for a still unknown reason.