First time anal!

So I had anal sex for the first time 2 nights ago. I had always wanted to do it but he went in without preparing it. No lube no saliva nothing! Although he did go slow and I actually enjoyed it after it was completely in, I'm now having a little bit of pain when I sit down. There's a little bit of burning it's not so bad but still it hurts! Any recommendations as to how to heal it? Thank you!