Actually what you said quite true... My ATB girl sibei ji siao me.. before I came back yesterday at airport, she says she bought a gift for me when she was traveling in Japan for business...
Last night, reached home, open the gift and guess what... This is what it is...
Didn't know what it is for until I googled and found out it's uses...I wechat my atb today and both of us have a good laff..She jokingly says if I "itchy", please use it...ROFL
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