It's summer break and guess who is cumming to visit us, Grandma Sally, she just makes my young dick hard just talking to her with that southern draw, I have a thing for those southern belles, BUT not my own grandma! That's insane, but she sure has a set of big ol' titties (I hope they pop out like last time). All was going really well, she got in early and mom wasn't home yet so I showed her the guest room. She wanted to freshen up and put on her bikini to do some pool time, but had a kink in her neck from traveling. Of course I offered to rub it out for her, but she reached back and started rubbing something out for me. She shoved me on the bed and pulled out my 10" cock and started sucking it, in no time I exploded in her mouth. She looks up and with cum dripping out of her mouth, and says to me, "Fuck me grandson before your mom gets home". My cock was more than eager for another round so we started fucking, fucking in every position. She can sure fuck for an old lady...better than the 20 year olds I'm fucking. We were really going at it hot and heavy but guess who pops in? Good ol' mom. This exactly what mom said to grandma..."What the fuck mom? You're fucking my son! First you fuck your son, my brother, and now you're fucking my son...your grandson?! WTF! Granny, as cool as a cucumber, comes back and says, "Give us a break Dani (mom). All we're doing is having some fun. You ought to take that splinter out of your ass and have some fun with us. He told me he wants to fuck you too, so get out of that bikini and join us and stop being such a drag". I was totally amazed. Mom stripped off her bathing suit and joined us. She deep throated me and soon I exploded a big load of cum in her mouth. What a great fucking afternoon this turned out to be, with another day planned tomorrow. Welcome back Grandma!