My brother made a joke about finding my vibrator, and was in for a surprise

I (17F) have a little brother (15M), and we have a pretty stereotypical brother/sister relationship. We fight, like everybody else, but for the most part, we get along pretty well. It's a pretty regular thing for him to knock on my door and ask for "tea time"; we're decently close. Every year, I participate in my school musical, and after rehearsal(the Saturday after this last Halloween), we had a cast Halloween party. The rest of the seniors and I had a group costume planned, and my brother and his girlfriend were going as Johnny and Mavid from Hotel Transylvania. I was getting ready at home, but my brother was getting ready at his GF house, so he was going to run in and grab his costume stuff. I had an unopened pair of vampire teeth that I was letting his GF borrow. We got back to the house, and he was going to hop out, grab his stuff, and then I would drop both of them off at GF's house. On his way in the house, I rolled down my window and yelled, "Hey, grab (insert GF's name) vampire teeth, they're in my underwear drawer. " he jokingly shot back, "Yeah, with your vibrator". I can't even imagine how far to the ground my jaw was. I was caught off guard because I knew he was joking, but I realized in that moment I did have a brand new vibrator in my underwear drawer, and my brother was already in the garage, before I could stop him. And obviously, his gf is in the backseat. If I yell " WAIT NO, DON'T GO IN MY UNDERWEAR DRAWER!" because obviously that draws even more attention. I'd like to preface that I've never had any sort of romantic partner; the closest I've gotten was a "thing" with my prom date, junior year, that never went further than cuddling in his basement, and even that guy moved on a month later. My friend and I are pretty open to each other about sex stuff, and a couple of months ago, I made a joke, saying that "at this point I might have to go buy a vibrator," which spiraled into both of us looking up whether or not you could buy a vibrator at Walmart or Target. Spoiler. You can. So we kept joking every couple of weeks that we were gonna go together and buy a vibrator. So, a couple of days before Halloween, I took one of my off blocks to run to Target and buy a vibrator. As soon as I got home, it went straight into my underwear drawer, and I kinda forgot about it for a couple of days. My brother came back out and didn't say anything, but we both know what he saw. He hasn't been weird to me or anything. I just think it's incredibly funny, and slightly embarrassing. A couple of days later, he came to talk to me about some sophomore drama, and as he was walking out, I stopped him and said, "Hey... remember Saturday?" and he cut me off and said, "I don't care. seriously" And we haven't talked about it since.