There's a good reason why Richard looks so spiffy at the start of his shift. The great Catherine Avery is in the house to help out with the case of a guy who has testicles the size of basketballs. She promises her slam dunk procedure will fix him right up. Bailey is disappointed to learn that April will be scrubbing in instead of her. This is so Catherine can avoid Jackson, who actually ends up scrubbing in anyway.
April bails on Catherine's operation because the woman is obsessed with the details of her sex life. No need to give her an opportunity to figure out that it happened to get jump started by her son. The surgery is a success in more ways than one as the patient gets the courage (or the balls, as it were) to tell his best lady friend that she's the best lady for him. Jackson also dials up the guts to tell Richard that he doesn't like that he likes his mom. The two of them come to an uneasy understanding with each other.
Meredith's intern, Heather, discovers a massive tumor inside an overly-emotional bodyguard. Mer keeps the news from her hubby because all he can do is teach a bunch of hopeless interns at the moment. As for the surgery, Meredith has no idea how she's going to attack the mass. The patient freaks a bit when intern Heather blabs this to him. As for Derek, Owen lets him know that the reason his wife didn't tell him about her surgery is because she may have been afraid he'd run off to the woods and grow beard. It's happened before.