"Cool, if you don't mind I actually need a shower myself," you told your dad. "That drive was miserable and all I can feel is this damn sweat clinging to me," you said, not untrue but happy to have a reason to bow out.
"Sure thing Caleb," Shawn said as you climbed the stairs.
When you shut the bathroom door behind you you let go of a breath you didn't know you'd been holding. You literally grew up with this man and his...tendencies...and they never once bothered you, so why now was it suddenly such an obstacle? Trying to remove the subject from your mind you prepared to shower, stripping away your clothes and stepping into the large stall, after all as huge as your dad was he basically needed a shower that could accommodate two to be afforded a good amount of comfort. As the warm water washed over you, steam billowing from the stall, you suddenly heard the door open.
"Uh...Dad...Why are you in here?" you asked.
Without an answer the stall door was flung open and your dad's, now dry, nude body stood before your now dripping one and he casually stepped in as you desperately tried to hide your crotch behind your hands, "Simple, now that dinner's started cooking I'm gonna finish my shower," he said as if it were as normal as saying "Hello" to someone.
"B-but I'm in here..." you protested.
"Oh come on Caleb I doubt you had your own personal bathroom at college," Shawn said. "Besides this isn't anything daddy hasn't seen before, I used to change your diapers."
"Yeah but I'm nineteen now dad," you hissed.
"Well then you should be a big enough man to not let a little nudity bother you," he retorted "Besides daddy always has a hard time reaching his back so you can help me out with that."
Resigning yourself to your fate you begrudgingly continued to shower, now a bit more cramped and competing for water, primarily stood behind your dad as he shampooed himself. Before long though your father finished washing his hair and, to your utter shock, turned to face you and slapped your side with a completely erected sixteen inch tool that looked capable of cutting diamonds. "Ready to help your old man out?" Shawn asked, completely unfazed by your shock.
"I...I...I...." you stammered.
"I'll just take that as a yes," Shawn said confused by his son's behavior. As if participating in an out of body experience you began to lather his large back using a loofah without thinking. This happened for a few moments until your father snapped your brain back into your body by loosing an undeniably sexual groan. Abruptly you stopped yourself but Shawn shamelessly said, voice breathy with arousal, "Don't stop boy." To which you promptly...