My girlfriend doesn't have alot of friends and asked me to get her toes done with her, what should I do?

FYI - I'm a guy and her bf not her bfff or whatever. She's been lonely lately cuz all her friends are in different places and she asked me if I would go with her and get a pedicure. She says she will pay but only if I get my toes painted pink. Should I? I don't want to be wasteful and take the polish off immediately but how long does it last? I wear shoes mostly so its not like anyone will know but is this a month commitment/ Week?