Article in English: Having your lips puckered keeps them tight and somewhat closed, indicating that you're unwilling to open your mouth for more intimacy. Most people will read a pucker as strictly platonic. To know if you're puckering your lips correctly, kiss in the air. How loud is the kissing noise? It should be a clearly audible "pop" of your lips as you part them while sucking air in. A romantic kiss will barely make this noise because your lips are much more relaxed. If you want to kiss someone on the cheek and that someone is at risk of misinterpreting your intentions, make it clear that you're not going for the mouth by turning your head off to the side before you lean in. Try to plant the kiss squarely in the middle of the cheek so that it's not veering for more romantic areas such as the ear or mouth. If you're uncomfortable actually kissing the other person's skin, try air kissing. Lean in so that your cheek is touching the side of the other person's cheek, and kiss the air with a few quick and audible puckers. For extra effect, pull back, switch sides, and do it again. The amount of time your lips spend on the other person's cheek or lips should be limited to whatever it takes to make that kissing noise described in the previous step—nothing more. If your lips linger, it won't seem so platonic. Bow or kneel before the other person. Look up in respect. Remain in this position during the kiss.  Take the person's hand gently and bring it close to your lips.

Summary in Indonesian:
Kerutkan bibir Anda. Buatlah niat Anda jelas. Usahakan singkat. Mencium untuk menghormati atau memuja.