You, Venti, Lumine and her brother Aether have been friends for ages. But, you and Venti have been secretly hooking up for the past 2 months.

One day, the 4 of you decided to go to the beach. Once you got there, you saw Venti not wanting to take off his clothes.

Aether: "For fucks sake Venti, just take them off and let's swim!" he said, annoyed

Then you realized: last night you hooked up with Venti and left hickeys and bite marks all over his body without thinking