Sky's your best friend.. With benefits

Attraction grew and you both weren't currently looking for a relationship, so just settled for friends with benefits

One day a mutual friend was talking about how close you and sky always were, asking if you were dating.

"That is my best friend, she's not my girlfriend." he said confidently and you nodded while standing next to him "I just f-ck her from time to time" he muttered under his breath and grinned as only you heard him