First date for years - advice needed

Tweet

I have been asked out for the first time since I was eighteen and I am now twenty six. This is how it happened. Kat, my colleague and I share lifts and this week it was her turn to drive. She has an on/off relationship with her boyfriend and it was indirectly because of that I found myself having to catch the bus home. Adrian, her boyfriend arrived to whisk her off to Paris for the weekend to make up for a row they had earlier in the week, which left me without a lift. Matt, a PE teacher stopped when he saw me at the bus stop and offered me a lift home. When we arrived home I thought he would just wave and leave but he wanted to come in (I thought the fact I lived in the vicarage would put him off). I have a big family (I have a twin brother, currently in America on business, four younger brothers and two sisters). Matt was given the first degree by my youngest brother, Tim aged 5, who asked him questions like "Are you Lydia's boyfriend? Have you kissed her? Are you going to look after her?" If that wasn't embarrassing enough Matt replied "Yes" to all of them! He had a coffee and a chat with mum (dad was out) and when I was showing him to the door, he said "I told Tim that we are going to the cinema tomorrow, will you come?" and then he said "I also told him I had kissed you" and he held me and kissed me and as he did my two teenage brothers made a noise like a sink plunger and said 'ooh!' and nudged each other and 'Dia's got a boyfriend!'. I am so embarrassed that everytime I think of it I want to hide for ever. I don't know what to wear tomorrow, or how to act. I was surprised at the kiss, what should I do tomorrow? Should I phone Matt and tell him I can't go?