What can I give my boyfriend for him to think of me at night?

So my boyfriend wants something from me so at night he can smell it and think of me or just something to have to make him feel like I'm next to him. I have no idea what to give him of mine. I wanna give him something cute but sexy at the same time. Really need a guys opinion or a preference of what he would like for his girl to give him. Open to any suggestions! Thanks!
What can I give my boyfriend for him to think of me at night?
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