Rapper Bun B -- Kevin Durant's My Homie ... You NEED to Sign with Houston!! (VIDEO)

Did you know ... rap legend Bun B is longtime homies with Kevin Durant???

It's true -- and now the rap legend is reaching out to the NBA superstar to convince him to sign with his beloved Houston Rockets.

With Durant officially on the market, the Trill OG made this video pitch to KD -- explaining why Houston is the PERFECT fit for a 27-year-old multimillionaire.