Luc Lafnet was a Belgian artist and illustrator. He was drawn to erotic and fetishistic subject matter, in particular to spanking art and literature. In such publications he used pseudonyms such as Viset, Lucas O., Grim, Davine, Rich, Pol and Jim Black. Below are his illustrations from the 1929 novel Les Confidences d’un Baronnet (The Confidences of a Baronet) by Arthur William Flogger. It is the first part of the Suite des Confidences d’un Baronnet, with the second part being Poker de Dames.
Les Confidences d’un Baronnet is available for trade here.
Smiles and Spanks, NaturallyGin.com
Smiles and Spanks 
Perhaps the title would be better translated as ‘The Reminiscenses of a Baronet’. This and the other novels you mention are from the ‘Collection des orties blanches’ or White Nettle Collection, published by Jean Fort between 1910 and 1932.