Question for a spell I'm making as a Christmas gift

Okay, hi! Let me get right into it

I am making a keychain spelljar for someone to carry around on their person 24/7 for Christmas. The goal of this spell is to make Person A find person B attractive/ make person A have feelings for person B.

My question is, who should carry the keychain? Person A or person B?

Sorry if this is confusing! I'd also like spell/ingredient recommendations for this spell if you can provide them. But the first question is the most important.

(Also I mean Christmas as in the general winter holiday. I am not Christian, I just enjoy being festive and it is a gift for 2 friends, just trying to figure out how I should write this spell)