13 dating 18 year old
This 21yo was fairly boring tbh, didnt smoke or do drugs, he had a full time job and was a bit of a mummy's boy lol.
The prev poster is right in saying dont come down hard on her, chances are it will be a fleeting thing and if you act calm you'll be able to monitor it easier than if you tell her you don't want him in your house etc. I met my hubby when I was 15 and he was 20 (I'm now 28) if my parents had tried to stop me I would definitely have rebelled.
Tell his parents to keep him at home and away from your daughter.
15 is an age where a girl can be quite mature and perhaps feels on a par with a 19 year old rather than boys her own age.
I will say though that going in guns blazing won't achieve anything.
I know that all parents have different opinions and thoughts on this but I do think you sometimes need to give a 15 year old the chance to prove that they can be responsible.
If you've had a chat and know that she's aware of taking precautions etc then it really doea come down to you trusting her.