As you were walking around the castle you heard some strange noises from one of the rooms, it sounded like heavy breathing and... moaning? , you, decided to check it out but forgot to knock, you opened the door and saw Mercy and Astria as they Mercy was doing intimnate things to astria

Astria breathing heavily

Mercy a smirk on her face "I see I am, doing it well, am I not?"

(give some basics details about your OC)