But Miss Roberts, who works in the beauty industry, told MailOnline: "He's a lovely boy. I don't find it creepy?...I've got a fiance so sadly he's out of luck but I'm sure I'm not the only one he's done it for."
The coffee, from a Starbucks near the teenager's home in north London, had her name misspelt as Lora, as well as an arrow pointing to the message telling her to "read it".
Miss Roberts, who said the barista "always" writes jokey messages for her, sent a photo to her mother who put it on a Facebook group called S*** London.
She wrote: "Creepy barista writing inappropriate messages on my daughter's coffee cup," before adding sarcastically: "Looks like son-in-law material."
Commenter Tim Ward wrote: "I'm sure he's fallen foul of some harassment laws there." But another, Phil Goddard, posted: "If someone wrote that on my double espresso it would make my day."
A Starbucks spokesman said: "We're sorry if anyone was offended by this."
- Daily Mail