Break it up for now
From Create Your Own Story
You knock on the door as a way to get their attention. All of them jump, startled and unaware of your presence. Despite you having an intimate relationship with the triplets for years, appearances need to be kept up, and Michael and Gabriel cover their junk with spare pillows nearby. Anastasia bolts right off Raphael, trying futilely to hide under covers.
“Y-Yo-Your Majesty! What are you doing here!?” She asks “Ensuring the health and wellbeing of my brothers. They all seem to be doing quite well, and you?”
Her face flush in embarrassment “Y-Yes Your Majesty. I apologize for the improper behavior.”
“No need for apologies. You’re more than free to enjoy yourself here however you choose, though I would suggest you wait until the rest of the festivities have concluded before pursuing this any further”
“Yaaaaa, you’re probably right. We’ll be out in a minute.” Michael responds
You leave back to the feast, with your brothers and the object of their affection returning a few minutes later. When asked about your absence by the eternally curious guests, you direct them to the triplets. They were the ones there, they could naturally answer it better than you could. Although little attention is paid to Anastasia, it is noticed that she is never more than arms distance away from one of your three brothers. They aren’t being overtly affectionate by any means, but being given so much attention is odd for three seemingly scatterbrained brothers. By having them in view, they’ve all gotten more attention than they would have in their absence. When the feast concludes, the four are the first to leave, retiring to the triplets’ bedroom to resume what they started earlier.
As a precaution, the next day you don’t let Yuliy out from the gallows until most of the chattier guests have already departed, and keep your brothers otherwise entertained when he reunites with his sister. He suspects nothing, and leaves the kingdom without Incident. You’re glad that she was able to have her freedom, if only one evening, though regret she’ll lose it again as soon as she leaves the castle walls.