Chapter 4: Return to sender

_ Author's note : If you're skipping around, I recommend reading at least the end of Chapter 3 before this one._

The weekend was the same routine as always. Do chores. Eat huge meals. Lift weights. Then more tests and measurements. We hadn't discussed the incident with Mark after that day, so I had stopped thinking about it. Father left for the lab on Monday morning as usual.

This time when I heard the doorbell, I had already finished my chores and was lifting weights in the garage. After last week, I figured it would be Mark again. I opened the front door, sweaty and naked except for some tight gray compression shorts. Mark stood on the porch.

"Hi Mark!" I said cheerfully. For whatever reason I didn't mind seeing him again, even though he'd basically forced himself on me just a few days before. In fact, I felt kind of happy to see the scrawny tiger. Unexpected. "What brings you to our house?"

"Your, uh, Father sent me here to pick up a box," said Mark awkwardly.

"Oh sure, come on in," I said, and stepped aside to let him by. He entered the house and I shut the door behind him. Mark was wearing a loose shirt, I noticed. But his khaki pants fit his frame well, and I could tell that his rump was firm and shapely. Not a bad body, I found myself thinking.

"Okay great. So... where is it?" Mark said. He seemed disarmed by my cheerful greeting.

"Where's what?" I replied, slightly confused. Mark's soft-featured face took on an annoyed look. He was standing very close, and I realized that I was several inches taller than him. And I had much more muscle, of course. I found myself thinking that it would be very easy to over-power Mark physically, if I had to. What an odd thing to think about.

"He said you would know which box. Where is it?"

"I must have forgotten, I guess," I answered apologetically. "Maybe you'll find it if you look around?"

With a snort, Mark went out to the garage. I followed him as far as the kitchen, and then let him look on his own. But he returned a moment later, his paws empty.

"Are you sure you can't remember what you're supposed to give me?" He gave me an odd look. "You're acting a bit strange, Andy."

"Gosh, I'm sorry Mark," I replied. "Maybe Father forgot to tell me." I took a half-step towards him. I don't know why I did that. A vague thought was starting to form in my mind. An urge, some kind of feeling that I couldn't quite put into words. Something about Mark, being here, now.

"You really are acting strange," said Mark, backing away from me. He glanced at the kitchen tabletop, and suddenly looked alarmed.

"Where is your tablet, Andy?"

"You mean Father's tablet?" I asked, taking another step. "I haven't seen it. I'm sure he has it."

"Well," said Mark, his voice taking on a tinge of panic, "I think I'd better get going." He started towards the front door, but somehow that felt wrong. I didn't want Mark to leave, not yet. I couldn't describe it, but I needed him to stay. The urge to keep him here was growing stronger. I side-stepped, blocking his path. He looked so small and weak suddenly.

"Andy, step aside." Mark's voice wavered. I barely heard him.

"Mark, can't you stay a little longer? I don't want you to go."

"Andy, just---" he tried to push me out of the way. But as his paw contacted my sweaty chest, the touch felt like fire. I gasped, and reacted without thinking to the burning feeling. Before I knew what was happening, I had grabbed his wrist, wrenched it backwards, and twisted it deftly around. My paws moved almost too fast to see. I stepped close and threw my weight sharply sideways, taking his paw with me and causing him to spin around. I now had his whole arm pinned behind his back. It felt like a single, well practiced motion, even though I'd never practiced anything like that before.

Mark yelped. He tried to break free, but my grip on his wrist was far too strong. I pushed him face-first into the wall and pressed my whole body against him. The heat of the contact was intense, and I suddenly wanted more of it. As I felt my sheath touch the base of his tail, the vague, urgent thought I'd been having since he arrived finally came into focus.

I wanted to breed him. I needed to. I had to put cum inside him. Lots of it, and deep. It felt so important, so... necessary. And it seemed like Mark's need, too, somehow. I started to gain confidence that Mark would understand, if only I could just satisfy this need for both of us. My cock started to stiffen, pressing against him through my shorts.

"Andy let me go..." Mark whined. He started to struggle, but I leaned harder against him. He was hopelessly trapped under my weight.

"Father said you would say that," I said calmly. "But you need this."

Mark whimpered. "Andy---"

I put a paw over his mouth, muffling his protests. My other paw found his rump, sliding his shorts down and lifting his tail out of the way. I kicked off my own shorts too, my fully naked form now pressing him against the kitchen wall. I guided my sheath under his tail and soon the tip of my thick cock found his hole. His whimpering grew louder as my cock hardened and pushed on his tight pucker. He tried to push me off of him, but he wasn't strong enough.

"Just relax, Mark," I growled into his ear. "I know what I'm supposed to do."

My cock was now rock-hard and I was starting to ooze more and more pre-cum. The slick fluid quickly coated the tip of my penis, and I could feel it starting to spread him open. Mark resisted, clenching tightly to try to keep my cock from forcing into him. But I kept pressing against his ass, and precum was practically gushing out of me. I was flooding his rump and hole with the slippery fluid. The urge to fuck him was incredibly intense now. I could barely think at all.

Mark quivered and grunted with the effort of trying to resist me. His arm and leg muscles strained against my weight. His pucker clamped tighter, even though with every throb of his pulse I could feel my cock overcoming him just a little more. The tip of it was already halfway in, and he was weakening. My own larger muscles were hot with the effort, but I wasn't particularly tired. He was no match for me now.

He kept struggling, and tried mightily to push himself away from the wall. I almost lost my grip. Thinking fast, I interrupted Mark's motion, quickly twisting his arms behind his back. My huge biceps flexed to overpower his smaller muscles. I grabbed both of his wrists in one paw, freeing my other arm. He tried again to use this moment to get loose, but I was much too strong.

His paws now pinned behind him, I pulled his head back and pressed his neck into the crook of my arm. I gave his throat a firm squeeze, and suddenly he couldn't get air. He coughed and writhed, trying even harder to get out from under me. I leaned in and slowly choked the breath out of him. His struggling became weaker, and I could tell he was getting disoriented.

Mark whined and gasped for breath, exhausted. Suddenly I felt his straining hole give way, and with a howl I buried my thick wolf cock deep into his ass. He let out a strangled yelp, but he had no strength left. He had no choice now but to take me. His whining turned to soft moaning as I began thrusting hard into him. I could tell he had given up, and he was ready to take the breeding I needed to give him.

I held him in the headlock as I fucked him, letting him have a little air once in a while. His neck lolled back as he drifted in and out of unconsciousness. The sensation from the tight grip of his pucker on my hard cock grew more and more intense. I almost couldn't stand it, but I kept thrusting. I knew I had to finish what I'd started.

I continued the pounding, my powerful hips and thighs shoving my dick into him over and over. His ass relaxed somewhat, making it easier for me to bury my thick shaft deeply inside him, lubricated by my pre-cum. I felt my knot swelling as my impending orgasm approached. The burning need I felt slowly changed into a thrilled excitement. Just one last thing to do.

With a grunt, I shoved my cock all the way into him one last time. My swollen knot pressed against his hole and stuck there. But I kept pushing, forcing myself against Mark's destroyed rump harder than ever. He groaned at the searing sensation he must have been feeling, but I didn't care. I had to tie with him, I just had to. Slowly, unstoppably, I forced my whole knot through his protesting little pucker. With a sudden pop, I was inside him. He screamed at the pain, but there was nothing he could do.

The heat and tightness of impaling him drove me over the edge. I felt my balls lift and my cock swell even more. With a loud howl I blew a hot, sticky load deeply into his ass. I saw stars as the feelings of ecstatic release swept over me. I held Mark pinned as my balls pumped him full of cum for what seemed like minutes. A supernatural quantity of my jizz flooded his guts, and I suddenly felt completely calm and contented. The hot fluid dripped out of him and pooled on the floor between my legs.

Mark slumped against the wall, and I let go of his neck and paws. He knew we were tied now, so he could only wait for me to finish. I leaned heavily against him, a feeling of warm satisfaction spreading through me from my ears to my tail. I felt that filling him up was all I had ever wanted in all my life.

I don't know how much time passed, but after a while the satisfied feeling kind of evaporated. In fact, within a few moments I couldn't even remember it, or why it been so important, so urgent to breed this tiger. My knot relaxed and eventually I was able to release Mark. He had fully lost consciousness, and slid to the floor in a heap. I noted with some detachment that he was breathing slowly, so I hadn't hurt him. Good, I thought.

With the same air of industrious detachment with which I might have folded the laundry, I cleaned myself up and changed clothes. Mark lay on the floor in the kitchen and I didn't disturb him. I simply went back to doing the day's weight training, and thought nothing more about him. Huh.

Mark was still on the kitchen floor when Father came home from the lab almost an hour later. I was in the garage, but I saw him arrive through the doorway. He laughed when he saw Mark, and poked the slumbering tiger with his foot.

"Okay fun's over, Mark. Time to get cleaned up," he chuckled, not unkindly. Mark stirred, and after a moment he opened his eyes blearily. He seemed disoriented at first, but then he remembered where he was. Awkwardly he climbed to his feet. He looked very angry.

"Jesus, you could have fucking killed me!" Mark shouted at Father.

"Oh come on, Mark, don't be so dramatic," Father replied. "Andy's safety incentives were stable the whole time. You weren't in any real danger. And," he added, looking at Mark's missing clothes and soaked fur, "you seemed to have fun, no?"

Mark looked stunned. "You... were monitoring that?" He pulled his shorts up awkwardly, looking embarrassed.

Father laughed. "Of course! That's protocol, isn't it? And besides, you gave us some extremely useful log data. You wanted to try a coercion scenario, and now we know how it works. Nice work. See yourself out, won't you?"

Father turned and disappeared into the bedroom. Mark stood dumbfounded in the kitchen for a minute, and then eventually left the house. He didn't say anything to me. Not really understanding what to make of any of this, I shrugged and went back to lifting weights.