Stewie's XXXperiments

“Goddammit Lois, I am enjoying my time with K’nex!”

“You’re 42 years old! Get down here!”

Peter had been putting it off for weeks, but he had agreed to go with Lois, take Meg and Chris camping. Brian was going to go as well, but had case of the hangover and more drinks. It would be nice to have the house to himself, save for Stewie. But that little tyke was practically taking care of himself.

Stewie, however, had lots of plans. With the family gone he would have time to try out his latest inventions that were a bit devious, to say the least. And he had no problem using Brian as his first test subject. Tinkering in his room, he heard the tires squeal as he heard the family take off for the weekend. With a sly grin, Stewie started making preparations….

A few hours later…

“Hey Stewie! Get down here, the Mac & Cheese is ready!”

“I swear to God dog, if those aren’t shells, I will flip my lid. You know I don’t like macaroni!”

“Of course, your majesty.”

The two didn’t talk much over their meals, Brian hadn’t had many failed relationships lately, and Stewie hadn’t taken over the world lately, so there wasn’t much to ridicule about. That was all they seemed to do to each other, Brian realized. But as he tried to think of something reasonable to talk about, he drew a blank. So their dinner continued in silence, until Stewie broke it.

“Oh Brian, I found a new collar that was in Lois’ closet. Maybe it’s for you?” Stewie presented a sleek black collar, looked expensive, with intricate designs circling the item.

“Probably, unless you know another dog that watches her kid.”

“Well, try it on!”

“Not ‘till after dinner, plus I don’t even know if she wanted me to have it yet…” Stewie pouted, but he didn’t want to push it. If Brian thought it was from Lois, then he would definitely put it on, and probably masturbate, fantasizing that would lead to something.

About an hour later, Brian emerged from the bathroom.

“Hey Stewie, check it out, it looks pretty good, feels weird though,” Stewie emerged from his room with a dirty grin, a wrist-remote on his arm with identical markings to Brian’s collar. Stewie pressed a button, and immediately Brain fell to his knees, electrical currents running through his body. Eventually, they stabilized, and he sat there motionless.

“Now follow me to the fat man’s room. Up on the bed.”

Emotionless and unresponsive, Brian obeyed. He went to the center of the bed and sat awaiting his next orders.

“Okay Brian, here’s what you’re going to do. I am going to play with you, and you are going to enjoy it, and have normal sexual responses to what I am doing.” With that, Stewie began rubbing small circles on his lower belly, going lower and lower until he reached his crotch. Much to his pleasure, Stewie began to feel his erection come out of his shaft. Proud of the reaction he could give his companion, Stewie got more aggressive, reaching one hand to fondle his balls, while pumping his growing shaft. A soft moan escaped the mind-controlled Brian.

“Hmmmm, you like that boy, don’t you. Oh yes you do, yes you do.”

Brian’s hips began bucking, thrusting to meet Stewie’s ministrations. Stewie was loving every minute of it. On one hand, he was more aroused and excited then he had ever been, and he could feel his erection growing quickly. The biggest turn on, however, was the dominance he had over his mate. Brian’s complete submission to him was one of his deepest fantasies, now being played out in front of his eyes.

Brian’s breathing quickened, and Stewie was ready for some doggy cream. He leaned down to suck the tip of Brian’s erection, and that was enough to send him over the edge. Brian began cumming into the boy’s mouth, letting out a dull moan as he did. Stewie lapped all his juices eagerly, not wanting to waste a drop. With cum drooling from his mouth, Stewie got up, relishing his partner’s release, but he left, back to his own room.

Still naked, Stewie returned sporting a large erection, one much larger than expected for a boy his age.

“Impressed Brian? Another one of my latest inventions, allows rapid muscle growth, and it appears to work here as well….”

The mind-controlled Brian didn’t respond.

“Oh, right. Well, get on all fours, you’re going to be my bitch!”

Brain did as he was instructed, spreading his tail hole and waiting to pleasure his master. Stewie brought his cock around to Brian’s mouth, and thrust in. Brian accepted the rough treatment, sloppily leaving his saliva all over his partner’s genetically enhanced erection.

“That’s enough of that, on to the main event!”

Stewie positioned himself at Brian’s hole, and pushed in. Upon Stewie’s instruction, Brian’s body relaxed, allowing the large cock to go deeper and deeper inside him. Stewie was in heaven, Brian’s warm orifice was squeezing, pulsing, and milking every part of his cock. Stewie leaned over him, gave him a nip on his ear.

“Okay boy, it’s time to start”

Sensing his master’s wishes, Brian slowly began thrusting himself backwards. With a slap, Stewie pushed hard into his ass, knowing he wouldn’t last long. Brian let out a low growl, only making Stewie speed up. Their pace quickened even further, the boy’s cock disappearing into the animal’s rear again and again.

Stewie began to feel hot all over, and his vision began to blur.

“Oh god… Brian!”

Stewie buried himself inside his dog one more time, feeling cum burst out from the head of his cock. Stewie passed out, on top of his mate, and not receiving any more instruction, Brian was forced to do the same.

The next morning, Brian woke up, curled at the foot of Lois and Peter’s bed, but was having a hard time remembering what had happened last night. Few too many martinis, Brian thought. He did remember a dream or something, involving sex, and getting fucked, but then as soon as he remembered, he forgot it. Whatever did happen, it left with a serious case of morning wood. Not sensing Stewie up, he ducked into the bathroom to take care of it.

Little did Brian know, Stewie had a lot more plans to experiment with his canine lover and inventions. Ding! Ding! Ding! Stewie smiled as he knew what this sensor was reacting to. He had put a sensor on Brian that would alarm anytime he was horny, and Stewie couldn’t wait to take advantage of this.

Before he could however, he heard a familiar voice.

“Brian? Stewie? I’m back! Peter and the kids are staying a couple more days.”

Stewie frowned, his mother here would at least disrupt his plans, unless she could be used as well….