A body lotion plastic bottle about 2 3/4 inches diameter.
I was staying at the relatives for a week and did not bring any toys with me. I knew in advance that we would be packed like sardina in a can (small apartment and lots of people) so it wasn't really feasible to bring any with me. After a few days staing there without butt play, my "anal urge" days hit me hard right there and then and one night when I could have the bathroom for myself a little longer I could not resist and locked me inside and searched the bathroom for something suitable to stuff me with. Everything (mostly cosmetic bottles) that cuold be used had something wrong that put me off using it (a cap that is just clicked on the bottle, a cap with square edges and such...). The most suitable shape was this body lotion bottle with a bit of taper and a small round cap that was firmly attached (screwd on). However, it was bigger than anything that I used in my butt before. Without much thinking, i lubed it with the same body lotion, lubed my butt, put the bottle on the floor by the bathttub and sat on it. At first it felt like I sat on a tree trunk and that I could just sit on it for ages and nothing would happen. Just pressure all around on my anus and perrineum. The smallish cap on the top of the bottle entered me and tased me enough to make me wiggle and rock up and down on it and after a while I felt that it went inside me enough to begin opening my inner sphincter. That was just what I needed to make me go for it. I wiggled more and some more ups and downs and I really could feel the stretch. Usually if I stretch myself beyond my limits, I feel a bit of pain. This time, however, there was none, just this marvelous feeling of stretching and fullness. I rocked up and down slowly, each time gasping for air and thinking "how much wider does it get? Can I really take it? Isn't it too much? Why the fuck am I doing this to me?" Of course I knew the answer; I'm a butt addict and it feels sooo good... I was expecting some pain but there was none... I was so high on endorphins that I went crazy and could not stop myself, I just wanted that thing inside me. Each time the bottle opened me a bit more, until the tappered part of the bottle slid past the inner ring and I was just OH... MY.... G.... I could feel myself wrapped around that bottle like a latex glove on a hand. I thought my bones had spread and I was wide as a train. I felt like my prostate being pushed up to my belly button and a hard need to pee. No matter how much I tried not to, some just leaked out of my cock. I stayed just like that, feeling the stretch and getting adjusted to it while trying to catch my breath. My mind was blank, completely overwhelmed with sensations. My whole being entered another state. I don't know how long I was in such blackout but I was getting tired in that position, so I held the slippery bottle with one hand, stood up (oh boy, what sesations) and sat with my thighs spread wide on the edge of the bathtub. Pushing the bottle in and out slowly made me loose my mind, it felt like nothing before. My eyes rolled inwards, I began to moan and breathe heavily, squirming. My other hand reached for my (soft!) cock and all it took was a few jerks to make my ass spasm around that bottle trying to grip on it and cum drip on the floor. It was mind numbing... The rush of blood to my head made me feel like I was floating in the air, my butt was throbbing and I could feel my heart racing in my throat. I almost passed out. Just held the bottle in place, while getting back to my senses... I pushed the thing in and out a few times more, feeling my rings give in from previous spasm while stretched max around that thing. Each time a shiver up my spine... I would go for another round but my legs were going numb from sitting on the edge of the tub for so long, so I slowly pushed the bottle out. I felt my supple hole with my fingers, pushed in 2, 3 then 4 fingers. I was never so loose. Pushed in easly to my knuckles and I felt I could go easily beyond, but I had to stand up, as my legs were hurting. I looked at my fingers and there was a reddish color to the lube on them. I washed my hands, grabbed a small mirror and turned my butt towards the light and bent over for a look. There was a tiny streak of blood on my anus. I wiped it off and slid a finger inside my still half open hole. Went around the insides with it to see if I can feel anything wrong. It felt OK, a bit stretched and abused but OK. There was no more blood. I guess it was time to clean up and go to bed, which I did. with my hands and legs shakeing.
The next day my butt still felt a bit loose, and luckily there was no more blood. I guess the excitement and the rush of hormones makes you do things you wouldn't otherwise. I was lucky to get away with just a minor tear. Later I did try to close my fingers around that bottle and there was still an inch and a half between my thumb and middle finger, so I guess it was almost 3 inches wide. It was by far the largest thing I ever put in me. I guess I won't be tearing my butt anytime soon (I did not want to that time either), but that bottle was an experience out of this world.
Next time I was staying there at my relatives, that bottle was still there in the bathroom, however almost empty. I immediately felt a rush to my head and thoughts were racing about doing it again, but I knew I should not do it. Someone made it easier on me, as the lotion was used up and the bottle was tossed in the trash before I could fall prey to my temptations. Oh, I'm such a butt addict...