Here are a few ideas that might suit your boyfriend's interest in hip-hop/rap:
1) Vinyl Record: Buy him a vinyl record of his favorite rapper.
2) Concert Tickets: Purchase concert tickets for him to see his favorite hip-hop artist perform live.
3) Merchandise: Hip-hop artists often create their own merchandise, like t-shirts, hoodies or snapbacks. You can look for one that he would like.
4) Headphones: You can buy him a set of good quality headphones. A music lover like him would always appreciate such a gift.
5) Hip-hop Art: Buy a piece of artwork inspired by his favorite rap lyrics or rapper.
6) Movie/Documentary: If your boyfriend is into films then you can go for a movie or documentary about hip-hop/rap.
7) Mixtape: Make him a romantic mixtape with all of his favorite hip-hop/rap tracks.
I hope one of these ideas helps!
Or you can get him a star map with the date of your first kiss.
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