My original tumblr post was here. This image was researched by Bacchus at ErosBlog as part of the “Δ commission.” The research was originally published at Hedonix as “Δ 041 – The Space Boobies Trap.” Here is what Bacchus found.

According to this blog post where the comic is reproduced in full, this artwork is from the bottom panel of the ninth (of ten) pages of the comic Selenia by Sergio Macedo, as the comic appeared in the first issue of Heavy Metal magazine in April 1977:

Brazilian and French comic artist Sergio Macedo is profiled briefly here. See also this slightly more detailed bio and some translated quotes from interviews with the artist.