You and Matt knew eachother very well. And were friends. Because you both are in theatre production. And have done theatre for a long long time. And both were great actors. You were a sophomore and he was a senior. You guys would sometimes go over af eachothers house/apartment. And both studied/did homework/theatre stuff/making props/to swim And both were very close.

In this case, you and Matt for the theatre's school musical. You guys were doing Heather's. He was Jason Dean. And you were Veronica. And you and him both got a scene together.

The backstage was crowded. And had no choice but to sit on Matt's lap. He said it was okay. And you at in his lap. What could go wrong?