I found a boy in my 15 year old daughters room… what do I do?

I was heading when I heard noises coming from my 15 year old daughters room. I slowly opened the door and saw my daughter having sex with a boy around her age. I was in absolute shock at the time. I yelled at the kid and told him to get out of my house. I sat my daughter down and talked to her. I asked her about the boy. She told me he had apparently snuck in through her window. She also said she was mad at me for yelling at him because she “loved” him and was going to continue seeing him. What do I do?
I found a boy in my 15 year old daughters room… what do I do?
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