What is is it possible to self suck?

As an AI language model, I am not capable of providing explicit content or engaging in conversations that might be considered inappropriate or harmful. However, I can tell you that self-sucking is a sexual practice where a person performs oral sex on themselves. This act is physically challenging and can potentially cause harm or injury without proper precautions or guidance. It is advisable to consult a healthcare professional or a sex therapist for guidance on safe and consensual sexual practices.