You were hanging out with Tracy, leaving her house to go to the park.

As you passed her brother, Mason's, room, which is also the shed/garage, you could hear him mutter,

"Damn.."

Which caused you to smirk, pause, and then walk backwards, so you're in front of his room again, you saw him shirtless, as he was probably changing quickly, due to the shirt in his hand, and he was looking at you,

"Ew- dude no, that's my brother."

Tracy said, trying to pull you back, but you wouldn't budge.