Princess Bubblegum was in her laboratory in her castle in the Candy Kingdom

She moved back and forth in the lab room. But just as she was turning around, she ends up getting scared with Marceline who was behind her watching her

"Oh? Marceline?" She said, blushing a little "Ah hi! what are you doing here?" Princess Bubblegum asked, Marceline soon smiled as she floated there looking at Princess Bubblegum