You Are My Indispensable Thing

The girl was panicked when she got her period for the first time: "Brother Mu Mu, I lost a lot of blood. I won't die, right?" "No..." The young man's cheeks were slightly red, and he didn't even dare to look into her innocent eyes. "Brother Mu Mu, he's bleeding again..." Years later, she pointed to the red spot on the big bed, still looking confused. A certain man had a black face and pounced on her. It was time to instill some knowledge into her! He has always been lucky that while he likes her, she also likes him.