Attraction runs on a clock.
She flirted for weeks. Touched your arm. Found reasons to be alone with you. And you were careful. Respectful. Waiting for the right moment.
The moment had a shelf life. It expired around month two, and by the time you asked her out, she'd quietly filed you under "little brother."
One of the hardest lessons inside the 22 Rules: women rarely wait. Interest either grows or it decays, and nothing decays it faster than a man who never moves.
Make the move while she's still inventing reasons to be near you.
See if you can kiss her so well she loses her balance and drops her stuff all over the floor. That's a fun challenge when sex is off the table*.
You asked her if she wanted to grab coffee. Then you asked if the time worked. Then you asked if the place was okay. Then you asked if she'd prefer tea.
Four questions. Four chances for her to say no. Four signals that you're terrified of making a decision.
Plan it. Pick the place. Pick the time. Tell her where to meet you. She'll either show up or she won't.
Either way, you look like a man instead of a scared little boy.
I wouldn't say it makes you "bad", but I would say it's a bit sketchy and not terribly sensible. You can wait a week for a boning, surely?