I don't know. There are different standards when it comes to wanking material for me.
Sometimes cute just doesn't cut it if you know what i mean.
I wish mom looked a little bit more mature, she looks like a shy 14 year old girl with big tits, wearing makeup and dress she stole from her mum. Aunt looks like she's twice her age.
I'm basing this mainly on this pic:
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Thing is, while this game has some very nice hot scenes and some cuties, it is not the selling point of the novel. It is the story, the nice MC (that is not a horny teenager coming back home, or a too caring daddy, or a too successful perfect guy everybody wants to fuck, or a combination of those), the thrill of setting that makes this novel good.
If you are just looking to fap, this game can do it for you, but believe me once you start playing the game you will be into it so fapping will be second.
And honestly, at no point in time did mommy looked too young in the novel. Neither did the aunt. They are sexy 40 years old women.
The way I go when in doubt about a novel is to simply go and try it. Worst case scenario I lose a few hours of time, nothing I have not done in netflix. Best case scenario, I found something good. And really, this novel is very, very good.