"Alright. I'll help you. But... can you take a shower first?"
You pause. That wasn't the response you were expecting. After a moment of awkward silence Dirk explains. "It's just Marty almost never showers and I have to hang around inside this basement with him for hours. Even when he does I don't think he does a good job. This might be my only chance to get him to wash himself properly."
That makes sense, you stink to high heaven "Okay fine." you answer and stand up, "Where's the bathroom?"
"Second door on the left" Dirk responds before lowering his voice "And could you put special effort into washing his...privates...not that I...they're just particularly...umm"
"Don't worry you don't need to explain" you cut him off trying not to think about the duo's sexual escapades which was still seared into your brain.
You make your way up the basement stairs and after taking a moment to catch your breath at the top, head for the bathroom. You shut the door behind you and look at yourself in the mirror. God how could anyone let themselves get into such a state. You have half a mind to give Marty a good shave...maybe after the shower. You strip off your hentai shirt and peel of the sweaty wife-beater sticking to your chest. Then you pull down your crusty gym shorts and the briefs which are slight stuck to your nether regions. A wave of stench is released from the stained and filthy making you gag a little. You try your best not to accidentally glimpse Marty's body in the mirror (It's bad enough you'll have to touch it you'd rather not have to see it too) as you turn on the water and step into the shower.
The water coming off you is almost yellow with months of accumulated filth. You scrub yourself all over eventually trying to reach your tiny cock. After lifting your massive gut to get under there you have to make your way past the pubic hair matted with weeks of dried cum and push back the pubic fat to coax your nub into poking it's head out.
Feeling a weird pleasurable tingle on your tiny cock grossed you out a bit as you scrubbed at it but at least you were finally making a little progress with this whole ordeal.