Autistic Nephew and my wife ⇐ Stories about incest

[Familyfantasy]

My nephew (on my wife's side) is autistic and he has a very "you do it for me attitude" and my wife just can't say no to him.
They have always been close and they are not shy of being naked around each other to the point at times he points at her chest and back side and says "huge boobies & huge bum"
As he's grown up I've had a feeling he will develop a huge crush on her and that seems to be happening.
Recently he's been showing a huge interest in her sexually and even complained about his erections and asking for her help he's rather blessed in the endowment department. (He still refuses to wear clothes when he's around her)

She's trying to hard to say no to him but as she's never said no to him she's feeling very bad about it and wants to help him.

It's not the craziest thing my partner would have done in the manner of "wanting to help with someone's erections"

[Bigeric9]

Why not let her say yes to him but say it’s just the once