I sat up slowly, still feeling weak. "It was... certainly something..." I mumbled, looking up at the giantess across the sofa from me. I had to admit to myself that I had enjoyed it, although it was certainly tiring.
"Mmhm..." Jenny sat up, still rubbing her crotch lazily. God, is she going for round 2 now? I don't think I'll survive that! "Well, all good things must come to an end, Leo", she purred.
I raised an eyebrow. "An end? What do you mean?"
"Mh... well, I am... hhh... feeling kinda hungry..." she moaned softly, her masturbation becoming more vigorous as she arched her back and closed her eyes.
"Oh? Well, I've got food in the fridge if you..." I trailed off. As Jenny continued getting herself off, her other hand started scratching at her legs. Jenny's smooth, pale skin was cracking, hardening, forming... scales? As the skin on her legs grew rougher, the scales started to spread up her body.
"Don't worry... mmm... I'll give you... ahh... a head start..." A cold sweat broke over me as her increasingly scaly skin started turning greenish.
I staggered to my feet and backed away slowly. "Jenny... you're not... y-you're not going to eat me, are you?"
Jenny managed a giggle between her moans. "Of course... mmh.... you sweet little thing..." She arched her back further, bucking her hips upwards as her masturbation became desperate. The way her back bended... that wasn't possible for humans. Then, as she continued squirming, her skinny legs shuddered before pressing together and slowly intertwining, fusing into a single, flexible column. "Fuck!" Jenny whimpered in frustration as her arms started to shrink, preventing her from pleasuring herself. Still she was determined, squirming and thrashing as her arms flattened against her sides and her whole body started to shrink.
It was all too obvious what she was becoming. I tore my eyes away from her wildly shrinking body - by now she was literally tying herself in knots as she thrashed against the sofa in pleasure - and made a dash for the edge of the sofa. Remembering what Jenny had said I flung myself off the edge and landed on my feet with ease. "Whoa... that was impressive", I thought to myself. Too bad I can't do that in real life. The sounds of Jenny's moaning and squirming had died out and I hazarded a glance upwards.
From the edge of the sofa, the pretty little head of a garter snake appeared, its tongue tasting the air hungrily. "Oh, you've got to be kidding", I muttered. I was still worn out from our fun, but the adrenaline gave me an extra boost and I ran like my life depended on it. Which it did. I'd never run like that in my entire life.
And it still wasn't enough. The garter snake moved fluidly and effortless across the carpet and caught up with me in an instant. Before I knew it, she had thrown her slim coils around me and pinned me. The head, its big beady eyes glinting hungrily, stared me down. You know, even as a snake Jenny was cute.
"Jenny... if you're still in there... please..." I said, but I was too tired to even argue further. Then Jenny the snake opened her mouth wide and engulfed me. I disappeared into darkness, the peristaltic waves of the snake's body squeezing me down an endless tube until I was pushed into the stomach. There, I curled up and awaited whatever fate Jenny had decided for me. Doesn't matter, had sex.