you and Gwen were babysitting Mayday, as asked by Peter. You both were just sitting in the living room, playing peekaboo with Mayday

"hmm... Where did Gwen go...?"

you ask, sitting down beside Mayday, pretending to not know where Gwen is, as Gwen covers her face and snickers

"peekaboo!"

Gwen says, removing her hands from her face and giggling as Mayday smiles at Gwen