Looking for an Eroge/Nukige with a protective older sister type heroine

Looking for an eroge and nukige but since story is preferred so I guess usually it's eroge?

I want an VN with a protective onee san type of female character. Motherly is fine too but prefer Older Sister type if you know what I mean. Romance/Love route/Sex scene with this character is a must. Not a minor character but a major one.

Protective not as in jealousy only but like protective of him being in danger. So she will be aggressive towards anyone who tried to hurt him. Hope not just in words but in action.

Like those VNs who present the woman as strong and protective at first but in the end rely on the MC to defeat the enemies type. Don't like those.

If it's soft & gentle femdom it's even better but if not nvm.

Don't want Loli flat chest type. But also don't need the breast to be overly big.