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That’s some pretty good translating Gijs
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No matter how difficult is the language… there’s a ginger cat in the avatar so everything is clear! 
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revolve a cup with one boundary curve
create a second curve and trim it from an orthogonal view
create a third curve for the seat to create the indentation you want
split the edges (or dup the edge then split the curve in case it does not work)
now rebuild the 3 curves with RebuildCrvNonUniform to get 3 equal complex curves and loft.
use FilletSrf to create a smooth boundary
from here on you can create your pillows, either offset the the lofted face or whatever i leave that to you.
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