Clean Up Ryoubi's Butt

"H-hurry up you fucking degenerate loser!" Ryoubi screamed, still quivering slightly. You'd ejaculated more than you thought you had, since even now there was still a little trickle coming from her anus. Ryoubi had ran into the water after you'd carried her close enough and dunked her lower half down repeatedly. You guessed that it was an attempt to flush out all of the semen from her asshole, but it wasn't enough, since she called you over while she kept splashing down into the water. After having let out her verbal tirade regarding your impulsiveness, she demanded that you go get the rag again and clean out the rest of the mess you made. After giving it a quick rinse with the bottle of water you brought with you, you trudged back out to her and pulled her bikini bottoms back down. The quick salt-water-rinse had managed to wash out the stain that was there before, but not the seed still dripping from her anus.

"Alright Ryoubi, I'm going to start."
"Fucking do it already, you pig!" Taking her queue, you wrapped the rag around one of your fingers and started. Beginning at the very outside edge of her pucker, you circled the opening with your rag-finger. The act caused Ryoubi to jump slightly and gasp, though she just gave you an angry glare and kept her mouth shut.

With the outside ring clean, you started to plunge your rag-finger inside. Penetrating her, you started to root around inside of her anus with the rag, pulling it out every so often to change which part of it you were using as it got too dirty. You pushed, poked, prodded, and wiped all around inside of her diligently in order to make sure that every bit of your seed was cleaned out of her. Sticking your rag-finger in deep this time, going right up to the base of your finger, you rooted around as best you could. Pulling out again, you were surprised when Ryoubi suddenly bucked her hips and let loose a moan that caused your boner to shoot back up again.

Evidently, your cleaning was stimulating her in ways you hadn't realized, probably because you were too focused to notice her start to climax. A long trail of fluid ran down her legs into the water below you as you stepped back.
"Ryoubi? You okay?" you asked, letting the sweat-drenched girl catch her breath. She stood straight up again and suddenly dunked herself down into the water a final time, pulling her bottoms up.
"Y-yeah, I-I-I'm fine, Anon."
"Well, okay. But I don't think I finished cleaning you out, there's probably still-"
"It's fine, Anon," she cut you off, "It's good enough." Shrugging, you turned and started to wade back onto the sand, Ryoubi at your side. As you left the water and headed back for your towel, you heard her silently whisper to herself, "Besides, I like having a little bit of you inside of me."

The words made a blush break out across your face.