My Overbearing Senior Sister

To survive in this world, one must be prudent, impassive, and merciless while he can't challenge someone out of his level nor consort with girls. Big sister, he is just at the Foundation Establishment Stage. Why would you bomb him with forbidden spells three times? Big sister, it's just bruises. Why would you feed me with Immortal Pills? Big sister, would you please stop pretending to be cute?(Source: WECOMICS)