Sam slowly started pushing forward, watching Riley's' face for signs of distress. It was taking all his power not to just ram his dick all the way into Riley, but he knew from personal experience that patience at the beginning ensured a more pleasurable time for them both. The head fully in, he noticed his partner clenching his teeth. Leaning down, he held Riley's head in his hands; he gave him a deep kiss.

"Relax bud, I've got you." Sam said

Riley nodded and gave a nervous smile.

Giving him another swift kiss he once again began to push his dick into Riley, changing his angle a bit to hopefully hit his prostate gland. Riley's' eyes were shut trying to ignore the pain that seemed to be increasing as Sam's dick continued to take up more space inside his ass. Sam must have changed angles because the pain became less intense and in it's' place a feeling of pleasure blossomed, but only for a second before the pain returned as the dick inside of him withdrew. As Sam thrust in once more his dick pressed into something that felt so amazing it caused Riley to open his eyes and open his mouth in a characteristic "O" of euphoria.

The first thing he saw was Sam's eyes staring right into his as this new feeling washed over Riley's whole body. Riley clenched his ass a bit tighter and used his legs to wrap around Sam's' waist to pull him in as much as possible.

Feeling Riley's ass clench onto his dick and his legs pulling his body even closer Sam smiled and Riley returned the gesture. A few more angular adjustments on Sam's part, Riley felt very little pain and started to really enjoy being fucked by found himself smiling very easily as Sam's thrusts became a bit faster and more urgent. Reaching down to start working his own dick again with one hand and used his other to tweak one of Sam's nipples. Smirking Sam took hold of Riley's dick with one hand leaving Riley a free hand. So he reached up and pulled Sam's head down by the back of the neck so they were kissing once more.

Kissing Riley's forehead Sam asked "You ready for a bit more...force?"

"Sure." Riley said in a breathless voice.

Sam made a devilish face and pulled himself almost entirely out of Riley, but paused, raised an eyebrow and looked at Riley, asking permission. Riley gave a crooked grin and gave a nod.

Sam slammed into him hard, almost immediately pulling himself back to the previous position and once again slammed into Riley.

"Hell!" Riley said rather louder than he meant but Sam didn't seem to mind about the possibility of his sister hearing them. In less than a minute Riley was holding on to the bed's headboard with his hands above his head biting lip. There was a bit more pain as Sam speed up but as he leaned down to kiss him his dick left his hole entirely than slammed back in, hitting his prostate with such force Riley felt a familiar tightness in his balls. Looking down at this dick, Riley watched as ribbons of cum began shooting out of his dick without any help. His furry belly was now a mess with cum all over it. Smiling up at Sam with a look of astonishment he noticed his eyes were closed, and a look of desperate concentration on his face. The thrusts became more erratic and sloppy as pleasure was starting to build for his release.

Riley reached up with both hands and pulled Sam down for a deep kiss as the orgasm hit. Their tongues wrestled and low groans came out of Sam's mouth. Panting Sam slowed and collapsed on Riley. This time it caused Riley's air to rush out into an "oof".His legs finally lowered as Sam's dick slid out of him. After a moment Sam raised himself up on an elbow, he gave Riley a soft smile and ruffled his hair.

"Not bad,eh?" He said wriggling his eyebrows.

"That's an understatement." Riley laughed.

Looking down Sam noticed the mess between them and shook his head.

"Come on." he said pulling himself up and dragging Riley along with him.

"What?" he asked looking confused but still allowing himself to be pulled along.

"We're going to have to take another shower, we're a mess and there's no since in taking two showers now. I think we've moved beyond the point of seeing each other naked."

"O.K." Riley said shrugging.

"Besides, I did mention my preference is a bottom and I want to know if your dick feels as good in my ass as I think it will." Sam said pulling Riley into the bathroom with him, closing the door.

Complete...but not definitely...I'm not totally pleased with how it turned out. I might come back and redo some of it at a later date.