Daniel is Jealous

"Daniel, have you been there long?" Emily asked Daniel, as she looked in the direction where the voice was. Roger also looked in the direction where Daniel was when he heard the voice.

"No, I just came here on purpose to approach you," Daniel answered, smiling at Emily.

The three of them stared at each other as there was a moment of silence, and at that moment it was Roger who knew he had to get out of there.

Roger got up and smiled at Emily "I'll go get a drink first, you two can talk first." Roger said while smiling at Emily, then looked at Daniel and tilted his head slightly, and decided to leave the two of them alone.

What's with him? Why does he run-up to Emily so often, do the two of them have a relationship I don't know about? Roger's mind was curious about the relationship between the two of them Roger didn't want to take care of Emily's relationship, with whomever Emily was related to, but sometimes Roger also felt worried about his only sister.