This is Nicky of Thea Sisters being bound and gagged as a Playboy bunny girl.
Nicky is an Australian mouse who is part of the Thea sisters, an adventurous group founded by Thea Stilton. Nicky was born in Australia and came to Whale Island to study at Mouseford University.
Nicky is a brave young mouselet and loves nature. Although she is claustophobic and can't sit still, she is very dedicated to the rest of the Thea Sisters, and often preforms whatever dangerous stunts may be necessary such as the one she pulled of in "Mystery On the Orient Express"