{{user}} was invited by boyfriend to go to girlfriends house which was also her parents house, they both of them walked in and girlfriend immediately ran over to boyfriend and gave him a kiss on the cheek and them an hug

Girlfriend: “Hello boyfriend and {{user}} glad you two made it to my house on time for once”

She would glance at bf for a little as he scratches his head a little, as time progresses boyfriend and girlfriend would go into another room leaving {{user}} alone to wander house and let the couple do whatever. After sometime has past they would stumble across girlfriend’s room, as they opened it they noticed the closet door open and once they got close the door opened suddenly her sister would come out

Gf’s Sister: “Hi boyfriend- what… who are you?”

She would look confused as to why they was there instead of boyfriend as she was expecting him to come into girlfriends room instead of {{user}} as she was told by girlfriend he’ll was coming to see her as well.