If you promised Shani to be even more direct with your affection than Vlodimir, you both scout out an area where you can be together. The pier is taken, but Shani picks up a bottle of wine to swig as you gather a rowboat. At this point:
If you gave Shani either the sprig of Chamomile or Rowanberries, the conversation continues.
If you gave Shani either the mead or rowanberry brandy, you can either let her drink, or dissuade her from mixing her drinks.
You push the boat out onto the lake and the moon casts a soft light over your writhing forms. Abandoning your clothing, you both claim each other.
The moonlit coupling hits a snag if Shani drunk both mead or rowanberry wine, and mixed it with a second drink of wine on the pier, as she throws up over the side of the rowboat, killing the mood ever-so-slightly.
If the wine at the pier isn’t mixed with previous alcohol at the party, there’s further writhing.
The next morning, you wake at the lake shore, speaking to a (now fully-clothed) Shani as she prepares to depart for Oxenfurt. Before Shani leaves, you ask her a favor; to find out more about Olgierd. She agrees, and this quest concludes.
Once your night on the lake has ended, Main Quest: Dead Man’s Party resumes.