My original tumblr post was here. These images were originally posted on tumblr by Diabolik Diabolik and identified as being from Planet Stories #11, 1942 (that would be Summer 1942; the ISFDB link for the issue is here), with an attribution of the cover art to Norman Saunders and the interior art to Winfield Scott Hoskins. The post comes to us via paranormallust-eroticart.