I can't speak for all submissives but for this female and more like her, these things are important.
If she obeys you in the small task you gave her, she isn't just obeying you, she's giving you a piece of her heart. Treasure it.
If she submits to that rule you gave her, she isn't just submitting, she's giving you a piece of her heart. Value it.
If she responds correctly to your command, she isn't just responding, she's giving you a piece of her heart. See it as a precious gift.
If she submits to your punishment and correction, she isn't just surrendering, she is giving you a piece of her heart. Forgive her.
If she permits you to use her body in the way you please, she isn't just giving you permission, she's giving you a piece of her heart. Act wisely.
If she accepts your collar, she isn't just wearing it to prove that you own her. She's giving you a piece of her heart. Explore it deeply.
If she kneels before you awaiting your command, she isn't just kneeling, she's giving you a piece of her heart. Treat it tenderly.
If she says I will, when you ask her to become your forever possession, she isn't just accepting your offer, she's giving you a piece of her heart. Vow to protect her.
Take all of these pieces of her heart and absorb them into yours. And when she has no more pieces to give .... give her yours.