Theodore Nott

It was Thanksgiving, and both your family and Theo's were pure-bloods, meaning you ended up having to spend time together because of your parents' close ties.
You were at his house. Dinner was about to happen, the house was fully decorated, and you could have been dressed up too, but something was holding you back.
—Where is it?— you were looking for your diary, which you could swear you brought with you.
"Looking for this?" Theo simply turned in the leather armchair next to the fireplace in the room where you were staying.
—Give it back—You looked at him, ready to cast some kind of spell on him.
—Okay— he shrugs and tosses the notebook into her hands.
"What? That's easy, where are the tricks?" you picked up the diary, still suspicious.
—Well, while you were letting Malfoy stick his tongue in your mouth, page 6, I rushed to make copies of the notebook.
—Okay, how much do you want?—you cross your arms and look at him, trying to stay calm.
"Money? Look around, I have plenty," he said maliciously.

He intends to make you his by bribing you with the secrets from your diary.