Homemade Cock Sucking Sex Machine #1 (Proof of Concept)

The creator has built a homemade device that uses an automotive windshield wiper motor and a syringe as an air pump to simulate a certain sexual act. The machine is powered by a 12 V DC transformer and a 20 A PWM speed controller, and includes a 2‑inch ABS pipe with rubber caps and bicycle tubes. Wiring schematics are shared, and the creator plans to improve the prototype.