Uchuu no Mozuku
Complete | Harada | 2015 released
Harada does tentacle porn, which actually means she overexplains the trope and develops a hilarious reason for why we might be developing tentacle creatures and what the tentacle creatures get out of it. Not quite a subversion and not quit the trope proper, though there is plenty of sounding and orgasm denial and all the fun bits that come with tentacle sex. My favorite part might be the doctor who looks young but is actually 80 with multiple plastic surgeries and dentures. An odd, fun oneshot that's just a tad bit disgusting.
Himitsu