Nagini felt that Tom just lacked love.
In his previous life, he followed Tom from rise to decline and was killed by a so-called savior.
Nagini decided to love Tom well in this life. Although she may lack love from others, she does not lack love from snakes.
It's just that it actually changed from a female snake to a male snake. Nagini, who has no idea about gender, feels that this doesn't prevent her from loving Tom well, does it?
Tom: Nagini, get off me
Nagini: No, no, no, Nagini must love Tom well.
Tom: How on earth do you know that I am lacking in love? [Gritting teeth]
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[Take a pit in advance]