Toy recommendation for butt stuff 🍑

My boyfriend asked me if he could use a toy on my butt while we have sex, which I am dying to try asap now lol so I need a toy that'll be good for that and I have no idea what to look for. We've done anal a couple times and I love it but it hurts so bad. Something smaller or a set of something? I'm so amped he asked for something because he's been a little vanilla lately and he's never actually asked for anything specific before. So, I wanna blow his mind and not have a sore butthole for 5 days after.