GF and mother compared at the pool

[LiverpoolMaster]

Just a basic starter idea for an incest story... or possibly an extra piece of re-inforcement in the build up.

Son is presented with a visual comparison of his mother and his girlfriend as they emerge from the pool together - the girlfriend something of a stick insect and lacking in the all-too-obviously female curvature of his mother. Thoughts... and loins... are stirred...

 

[DarkSollat]

I've seen this kind of things in @TheTalkMan 's How to Get a Job at Fucking. The FMC seduces the MMC comparing her curvaceous body to his wife's 'uninsipiring' shapes. Didn't like this kind of degrading play.

 

[Rob_Royale]

I'd take this is a mother-in-law direction and he notices that his wifes sweet curves definitely came from her Rubenesque mother.

My story Pretty Please is about this very thing. I don't really care for degrading a character either.

 

[SteelPoint]

"Degrading"? That's laughable. It's just a simple fact that the whole of life is competitive, whether we like it or not. People are always drawing comparisons. It can happen simply subconsciously or in our innermost thoughts... and as LM says, it can produce an almost spontaneous physical response.

Life doesn't run according to some set of idealistic rules, thank God, or for starters we wouldn't have the rich resource of erotic themes, complete with taboo thoughts, which this particular forum plumbs.

 

[Carnevil9]

Many moons ago there was a TV commercial for Grape Nuts cereal, where a teenage boy mistakes his GF's mother for the GF, and playfully grabs her in the pool. The tagline "I thought you were Dale!" was a bit of a proto-meme back in the day. The point being, the cereal kept Dale's mom in the same shape as her daughter. Anyway, there might be something in that idea.

 

[DarkSollat]

So to twist it to something more alluring to me:

1. MC compares his girlfriend to her step-mom and discovers they're in equally good shape. He now wants to fuck both of them, preferably at the same time, preferably with some step-incest.*

2. An awkward conversation ensures akin to Rick & Morty's "Your dad keeps bees" dialogue.

* Drawing inspiration from one porn movie I've seen (although it was 3F): the GF rides MC's mouth whilke her stepmom rides his dick. Spurred by the moment, the stepmom leans toward her daughter but she says: "You're my mom, that would be weird/wrong." To which she responds: "I'm your step-mom" and this is enough for them to kiss.

 

[Reenigam]

Many moons ago there was a TV commercial for Grape Nuts cereal, where a teenage boy mistakes his GF's mother for the GF, and playfully grabs her in the pool. The tagline "I thought you were Dale!" was a bit of a proto-meme back in the day. The point being, the cereal kept Dale's mom in the same shape as her daughter. Anyway, there might be something in that idea.

Well, that's virtually what the OP was suggesting, leaving aside the cereal part. Making it his own mother rather than the GF's brings in the taboo element and it needs building from there with various things feeding into it, not least some arousal in his direction by the mother.