DD, 17, learnt to drive last year and always got on very well with her driving instructor (male, 59). After she passed her test she sometimes, not regularly, met up with him for coffee which DH and I were perfectly happy about as they always met during the day and in public places. I have met and talked to him on several occasions and he seems very pleasant, there was nothing creepy about him. Last Friday she went out to a party and said she would probably stay over at a friend's house. No problem there as she has done this before except she arrived home at 5.30 am which I thought was an odd time as why not stay until mid/late-morning, as usual? DH and I queried it and got fobbed off but we both knew she was lying. On Sunday she confessed to me that she felt "out of it" at the party as she was the only one not drinking (not true actually) as she had to drive and had rung the ex-driving instructor who had suggested she go over to his, which she did. She told her friends she was going home. She stayed the night at his but insists nothing happened between them and they were just talking until early morning. With hindsight, she knows how dangerous this situation could have been. She has never had a boyfriend but was talking to a very nice boy up till Christmas although nothing came of it, apparently because he had awful friends. She often makes negative comments about how "vile" most boys her own age are. I am now suspicious that there is more to her "friendship" with the ex-driving instructor and she is not getting with boys her own age as she is interested in him, although she swears blind she isn't. Are we over-reacting and the whole thing could be platonic or are we just naive?