Summarize:

While you may know your Snaps are flirty, your crush might still be wondering if you're interested. Respond to their Snaps and stories with quick, flirtatious lines like "I like that!" or "You don't look so bad (winky face)" to be obvious without being overwhelming. In a chat, ask to see something in your crush's life. This could be anything from their beautiful eyes to their new kitten. Even if your crush just sends you a photo of their morning bus ride, remember that they did it just for you! Snapchat messages disappear after 24 hours so they should be brief. Once your messages venture into 2 or 3 sentence territory, get your crush's phone number or ID on a text messaging platform to keep the conversation going.
Respond to their Snaps. Ask for private Snaps. Move the conversation off Snapchat.