She texts, " I'd love to, but my web cam is broken." He thinks,"'She interested."
She texts, "I'm a vampire. My pictures don't show up anyway." He thinks, "She's flirting."
She texts, "I'm afraid they'll get passed around at school." He thinks, "She's wants to very careful."
Here's the thing, half of the world's population can't catch the hint. If you do not want to do something say no. You don't have to be polite. You don't have to spare their feelings. Just say no.