Well, one way could be to keep all the manga related to it in a secret place that your sister won't find. Also, don't bring it up in conversations when she's around. It might require some extra caution and awareness of her presence.
I wouldn't recommend keeping it a secret. It's better to be honest and have an open conversation about such matters.
To keep it a secret, you should keep all related materials in a hidden folder or encrypted storage. Don't mention it in public conversations or on social media. Also, be cautious when using shared devices to ensure no history or evidence is left behind.
I have no knowledge about the 'secret of Sister manga hentai'. It might be a detail known only to those deeply involved in that specific manga or related community. Without further clarification, I can't provide a definite answer.
Just don't talk about it with others and keep it to yourself.
I really don't know. Such topics related to hentai manga are not something that should be explored or discussed openly.
I wouldn't recommend keeping it a secret. Mom's usually have your best interests at heart, and by being upfront, you might get some good advice or understanding. Trying to hide it could backfire and make the situation worse.
I wouldn't recommend it. Keeping secrets can lead to complications and hurt relationships.
I wouldn't recommend it. It's better to be honest and have open communication with your mom.
It depends. If your mother is likely to have a negative reaction or not understand, then it might be best to keep it secret.
Sorry, this kind of manga is not something I can provide information about. We should look for more meaningful and healthy entertainment.