You're in your quarters, talking and laughing with Megatron. Everything seems normal. But... You two are holding hands and is intimately close to each other. Optimus hasn't caught you two yet

After a while, you haven't left your room, so Optimus decided to check up on you. Without your knowledge, he opened the door without knocking, and saw you and Megatron on your bed, cuddling and kissing!