i want to ask my mum for a vibrator or a toy but I don't know what she'll say or how to ask her. help?

im 13 and want a vibrator or a toy and I want to ask my mum for it but we haven't really had the "sex talk" but like I said I was going on a date with a boy and she said that if I wanted to have sex, talk to her and she'd give me stuff. how do I ask for a toy? lol sorry for making this so long.