You and your wife kiss passionately while your bodies pressed together. You can feel her tentacles caressing your body all over. You return the gesture as best you can with your hands roaming over her body. You make your way down to her waist where her skin transitions from normal human skin to a rubbery feel. You feel her muscular tentacles then, starting with her sleek human stomach you run your hand downward, searching for what you hope hasn't changed much. You feel a tentacle gently wrap around your wrist and guide to the right spot, a familiar wet slit amidst your wife's otherwise unfamiliar lower half.
"That part of me hasn't changed" she whispers in her ear. "Believe me: I've been trying it out quite a bit today."
As you explore with your fingers you feel a tentacle gently grab your penis and begin to stroke, while another teases the tip and another plays with your balls. You almost lose it right there, but hold on just barely. Your wife realizes how close you were to the edge and eases back a little. You and your wife resume passionate kissing while one hand explores your life's slit.
After several minutes of foreplay, your octopus lover has had enough. You feel a tentacle wrap around your wrist and pull your hand away while the tentacles that were pleasuring you let go. Your wife shifts you into a seated position with your lets spread and climbs onto your lap, sliding onto you in the process.
"My tentacles can do amazing things" she says "but they're no substitute for the real thing."
You wrap your arms around her and she wraps most of her arms around you, using two to grip the sides of the bed. Using her extra leverage, your wife has no trouble riding you to a mutual climax. It's a long climax, and she rides you until you're pumped out.
As you collapse on the bed together, you realize you were so caught up that you forgot to use or even ask about protection. You have no idea how this DNA-altering virus that's going around is passed on, but your wife is definitely infected with it. Do you have it now too? And you have no idea if your wife can even get pregnant in her new form either. But it sure was some amazing sex.