Parker is a hard-working guy. He knows the value of good nutrition and exercise. That's why he's imparting some valuable knowledge to his friend Jay. Jay is an avid basketball player and enthusiast, so Parker's showing him some stretching techniques from an old-but-wise P.E. textbook.
From the butterfly stretch, it's natural and healthy to move into a position that loosens up the cock muscle. Parker's been well trained in this particular exercise and is using this expertise to help Jay. By wrapping his lips around Jay's hardening dick, Parker is preparing the muscle for an even more vigorous routine. Parker's heard that Jay's an expert in stretching tight assholes. That's why he's eager to receive a nice, hard pounding from Jay's swollen cock.
Learning to maintain good health habits can be challenging. But with the right tools for effective stretching, and a helpful partner like Jay, Parker just can't lose!