After a few hours, Mary felt hungry. She went to the kitchen to prepare dinner, and Jeff followed. "Meat" he said. Mary put some on a plate for him and put it on the floor while she stood eating her own food. Jeff no longer had hands, but he did have was an impressively long and dexterous tongue. Mary watched with fascination. She knew real spiders didn't have a tongue like that. It reminded her of Venom, from the comics. As Jeff consumed his dinner then wiped the plate clean, Mary began to get wet at the thought of that tongue in her. When she couldn't take it any longer, she put down her half-eaten food on the counter and went back to the couch. She sat down and spread her legs wide. Jeff gave her an inquisitive look. She was amazed how much his face still looked human if almost everything else about his body had changed.
"Desert" she panted then licked her lips suggestively. Jeff got the hint. A moment later his face was in her crotch and his tongue was pleasuring her in ways he never could before. She screamed with pleasure as Jeff drove her into a series of orgasms. When Jeff finally stopped and backed way, Mary was drenched in sweat.
And yet Mary wanted, needed more. "Mate with me..." she begged.
Jeff climbed onto the couch and onto her. Jeff's body mostly resembled a human-sized spider, except his face and skin...and the one thing Mary craved right now. Mary knew spiders had very different private parts than humans so she was so very glad that part of Jeff was still essentially human. She gasped as he slid into her. Human, but bigger and better. She wished they could be face to face, but instead it was her face to his chest. Jeff kept his back legs on the floor, put his forelegs over the edge of the couch to hold onto it as best he could, and used the four middle legs to reach behind Mary and hold her as best he could without hands.
Mary couldn't believe how much she wanted to be fucked by a spider. But he was still Jeff, still the man she loved even if he was less human than normal.
Even as she felt another orgasm building and she could tell Jeff would soon climax as well, Mary felt something else. It was her sides. It reminded her of before, when she had drank the vials and grown extra arms. She orgasmed as the extra limbs burst forth. Mary looked down and was shocked. She had had she grown extra limbs again without drinking the vials again. And this time her extra limbs didn't match her arms - they were fleshy spider legs, like Jeff's! Sex with Jeff must be transforming her. She had better stop, had better drink the human vial again to be safe, had better...finish mating with her spider lover. She wrapped her new appended around Jeff.
"Don't hold back any longer..." Mary cried out. Jeff thrust deep inside her and exploded. Mary could feel his seed filling her and it had never felt so good.