Here we will encounter the life of 15 year old Castiel. With an embarrassing secret: He has Hydrophobia.
He enters into high school. He needs a Physical ED credit in order to get his diploma and graduate from high school. Ironically, he was put on the swim team. He informs about his condition, and instead of an actual swimmer, he's a manger of the team.
When the team goes to the pool for the first time that year, he spots the fastest, the best, swimmer of the team, Junior, and team Captain: Dean Winchester.
**Sorry for the Frozen references**
[WARNING: SMUT SCENE MIGHT BE CONSIDERED RAPE TO SOME INDIVIDUALS]