We where on the bus playing truth or dare!?

I did an orienteering enrichment after school on friday and me my friend lucy, my bf dom and gareth. We were playing truth or dare and i got dared to snog dom i was fine with this but then as we were snogging the bus driver saw us and told are head teacher he said he wants "words" with us on monday! what should i do or say? are school dont like this kinda thing cos we are only year 8