Been looking for a while now

Hey guys,

I'm looking for two manga I read years ago. One is about a guy who only wants to masturbate and thinks real sex can't compare to masturbation. His younger sister hears this and decides that she and her friends will show her brother the joy of sex with 3D girls. I just can't find it and can't remember the name of it.

The other is about a guy being asked by his older sister to come stay a while with her and all of her friends. I think she and her friends are all university students or something like that.

Anyone have any ideas?

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