Drunk with my Nephew

Six weeks ago my Step-daughter's son Tyler came over for a weekend visit. He is seventeen years old and according to his Mother, "needs some Fatherly guidance". My wife was out of town for the weekend so this gave me plenty of time for advice. Saturday I took him fishing and we spent most of the day discussing hobbies and his future plans, which were not very promising. After dinner he presented a bottle of whisky and asked if I wanted to help him drink it, and I figured this would be a good way to get him to open-up. After a couple hours, half of the bottle and a lot of laughs he got quiet and asked "what do you think about guys doing each-other?" I asked if he was referring to himself and he was, "but I'm not gay, I fuck girls too". I asked him if it as just fucking, or were there feelings involved and he said that him and two of his friends often ass-fuck one of their brothers and that he's gay and really likes taking it up the ass. Tyler added that he has taken if up the ass a few times and that he likes it, but is confused about whether he is gay because he likes doing girls. In my drunken state I told him that, about thirty years earlier, his grandmother and I were swingers, often attending orgies, we did wife swapping, and blind-fold sex, and often I would fuck a guy's ass, suck cock, and take cock up the ass. I told him his Grandmother got really hot watching me do other guys and that was what made her love getting her ass fucked. But what we were doing was just fucking, everybody took part in everything, it was the only condition to membership. I added, "I'll be honest, I liked getting my ass fucked, it felt good, and I liked sucking cock. But I liked fucking your Grandmother, and her friends more."
Tyler said that's how he felt about it too, but just didn't know how to say it, then he added "I have also fucked my Mom, What do you think about that?" I asked if it was more than once and he said it was two or three times a month for the past year or so, but she's always drunk and I don't think she remembers in the morning. What if she does know, but wants you to think she doesn't? He answered, "Sometimes I think she does because in the morning she sometimes walks around the apartment wearing whatever I left on her". The whisky was taking it's toll on me and I felt my eyes trying to close. Tyler told me, in detail, how at first his mother would try to stop him until he got into her and the last few times she is completely limp and he does whatever he wants, including fucking her ass which, he says is far better than his friend's brother.
After staggering to the bathroom and back I told Tyler that my old age can't drink like I used to. Most of the night after that is foggy but I do remember feeling something around my mouth and after a few seconds realized it was a cock. I was unable to open my eyes but had no problem opening my mouth and I very clearly remembering starting to suck on a thick hard cock. It had been about fifteen years but their was no mistaking the feel of a cock in my mouth and I was enjoying it, even as drunk as I was. I don't think I knew it was Tyler's cock, but really didn't care, it had been a long time and I was going to suck it dry. With my lips locked onto the stiff meat it began to pump in and out of my mouth even causing me to gag when it tried to go down my throat. And that disappointed me because there was a time that I could take ten inches down my throat without choking. I was becoming more coherent as he picked up the pace enough to start my head bouncing but I wanted whoever was fucking my mouth to think I didn't know, then I remembered Tyler. Thinking about his wondering if his Mom knew he had fucked her, I decided I'd keep him wondering as well. I was impressed with his stamina as my jaw began to ache, but I wanted his jism and I was going to get it. Just when I thought my jaw would fail, he groaned, shook, and blasted an impressive wad into my mouth, keeping my mouth full while I sucked every drop out of his cock. When he pulled out I held my mouth in a sucking position, mainly because my jaw hurt, then slowly opened my mouth so he could see his sperm. When he rubbed the head of his cock over my face I closed my mouth and swallowed every drop, then went "back to sleep."
I don't know how long it was but the next thing I remember was that feeling that my asshole was stretching, even though it had been over twenty years there was no mistaking the feeling of a cock entering my ass. And yes, it hurt, but it was a good hurt. Slowly he forced his throbbing member deeper into my ass and I let out a long, soft groan, remembering how good it really felt, and wondering what he used for lube. He thrusted, I grunted, then he commenced to pumping my old ass and I showed my pleasure with moans and groans and grunts, and I even felt my right leg start to shudder when he picked up the pace. I kept my eyes closed and remained limp as he built up to a frantic pounding, so much that I could feel my body bouncing on the floor, it had been so long and I never knew how much I missed the incredible feeling of such an awesome cock fucking my ass. Because he had already cum his stamina was even better and I was thankful because it gave me the opportunity to shoot my wad and when he came I used my ass-cheek muscles to squeeze every drop into me. When he finally pulled out I felt his cream oozing from my asshole and began thanking him silently.
When I awoke the next morning I was on the floor in the livingroom, right where he had given me what I forgot I wanted, and he was sleeping in a chair. I answered my question about lube when I found the margarine on the coffee table.
After breakfast his mother arrived and before he went out I grabbed his crotch and said "Come on back anytime" and seeing his mother advertise her long legs with a short skirt and her big tits with a tube-top I added "and bring your Mom".