I am Arabella Lancelot.
A Ravenclaw.
Ravenclaws are always fair and they will always know their choices.
Like... I choose to be with a Slytherin.
And no matter now or in the future, I don't want to leave.
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Sink originally means sinking or sinking. But the meaning I give it here is fall. Draco unknowingly stepped into her charming lake step by step, gradually sinking but couldn't bear to leave.
Then, let him and her always be immersed in happiness and never be able to extricate themselves.