She interrupted your train of thought as she grabbed the fluffy tentacle of the octopus.
"Jack that's a great idea! I mean if we don't need a second person, I can just be the octopus on my own! I can have my cute boyfriend here study me~" She said, giving you a playful poke above your crotch out of view from Jack.
She giggled before dragging the suit back a bit.
"You find a lab coat or something while I go get "changed" into this octopus!" She said before vanishing into the changing rooms.
A moment passed as you found a lab coat before you got a message from your girlfriend saying she needed a bit of help. Being the good boyfriend you were, you went to help. As you entered though, you saw she was completely naked. You've seen her naked before in her apartment but the fact this was in public made you blush.
"I need you to take my clothes and help me into the suit. Hold it still as I get in!" Shd said excitedly before giving you a long sensual kiss, her D cup breasts pressing against your chest before dragging a light finger under your chin before going to the massive plush costume. Even though the changing room was about as big as hee apartment, the costume took up most of it. You held the body up as she slowly struggled to get through the tight plush hole. Her pussy visible for a fraction of a moment before her long toned legs vanished past the soft fur. To your amazement, the hole slowly began to close! Sealing completely as all was quiet for a moment... before it began to move! Tentacles slowly slithering as it got used to its new body. A fluffy tentacle pushing against the wall to get it upright, the two giant googly eyes battling and wobbling as it adjusted itself. Even though they were unable to express themselves without eyebrows or a mouth, you could tell they were excited, their tentacles curling a bit as they pushed a single tentacle against you and gently lifted you up and held you against them. You then thought of what to do...