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This is fun and playful; however, if she seems to not like it or tells you to stop, make sure to do so. If she is interested in you, she may laugh excessively, blush, or tickle you back. Keep in mind that some people just don't like tickling, and this might not be an accurate reflection of her opinion of you. If you feel like you are at this point, try holding her hand while you are walking or alone together. If she continues to hold it, there is a good chance that she is interested in a relationship with you.
Tickle her lightly. Hold her hand.