When working with self-sucking portable devices, it's essential to follow proper safety protocols and guidelines:
Individual physical proportions, such as the length of the torso relative to the limbs, play a significant role in determining how accessible certain positions are. Common Positions for Flexibility how to self suck portable
For a portable experience that mimics self-sucking without the physical strain, several automatic devices are available. These are often marketed as "sucking" or "oral" masturbator cups. autofellatio - Wiktionary, the free dictionary When working with self-sucking portable devices