Witch Mercy and Black Cat D.Va, wearing lingerie based on those two skins. Reference images for the lingerie are below, although the details of the actual outfits can vary quite a bit. What's more important is just keeping the theme. As for the pose, I'd like D.Va to be on her knees, looking up at Mercy, who is wearing a strap on. Specifics of the pose are up to the artist.