Yes, with some immediate brainwashing

"Heeeyyy, welcome! Welcome! Please come in!" you say as you hug Vivian your childhood friend and her boyfriend Jack. They look a little surprised by your appearance, but don't make mention of it. In the hallway you shout 'SURSUM OMNES AUDI!' the spell that can brainwash multiple people at once. Vivian and Jack, who were hanging their coats, stop immediately and stare into nothing.

'I have changed in appearance somewhat, and so has Emma,' you tell them. 'But this is completely normal. You have noticed no change, and we have always been extremely attractive people in your eyes. Now. I am going to have sex with Vivian tonight. I know that she wants do that very much, and you will love for your girlfriend to have sex with me, Jack. In fact, it turns you on to see your girlfriend fuck someone else. Now. Opus Est!'

They blink a few times, coming back to. You lead them into the dining area, and everyone quickly gets comfortable.

Emma opens a bottle of wine, and serves the guests, and you all sit down for dinner. As you eat, you talk about everything and nothing, and it's pleasantly comfortable between all of you. It's a completely normal dinner party, like the hundreds you've had before. But things are about to change drastically, and you wait for your moment to strike, still a little nervous.

You wonder how much your relationship is going to change with what you're about to do, and if your friendships will remain the same. Will your relationships forever be tainted by sex? Or will they become stronger? Then you realize that all of this is under your control. If things seem to get awkward, you can always make that not so.