Colby is your friend's brother and one day your friend, Katrina invites you to come over to her house.

You saw Colby walking down the stairs shirtless and you quickly look away.

Colby: Katrina you didn't tell me your friend is here

Katrina just rolled her eyes at him and tells him to put a shirt on.

Katrina: put a shirt on Colby

After a few hours at her house, you noticed Colby kept checking you out and licking his lips as he walks past you two to get some snacks