The one advice I would like to give you is have more imperfections

The son is a stud
They are all alone
Mom is hot
Beds perfect
Water is warm... At night
Etc

Button may thinks it's warm cause she's swimming and jumps, which can make for a fun moment of her laughing and him whining until he adjusts and may or may not does or says something after...

Who didn't go to a swim pool and made that mistake?! I sure did! Once adjusted water is fine but your body needs a moment.

Mom might be wise enough and took it slow. Rubbing herself with water and use a ladder for a more gentle approach :)

It shows a gap in experience too without spelling it out !

I hope i explained that well enough
Nothing wrong with hiccups. They are spice of life

Ps. This can apply to sex too.
Not slapstick ofc... just a few oddities or quirks
That's how that is. You feel a bit silly but know it's alright..

Button seems made for quirks
😉

Feels to me it would make things more relatable and more vibrant to read.

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Thanks, appreciate the advice. I'll try that out next story.