She was there laid next to me on her back as my hand stroked her plump belly, I gave her a nice wet kiss then fondled her big breasts, licking her nip...ples, she was so excited, I could tell when I slid my hand down under those lovely cotton knickers to her pussy, she was wet as hell, I always though old ladies were dry down there but my Gran was really wet as I tweaked her clitoris and slid my finger in mmmmmm, my cock was throbbing like hell, I had a nice lick of her pussy over her knickers. She continued moving her hand down to my belly, and I started to feel my cock harden. Guessing she was not thinking about what she was doing, I moved to roll over to hide my growing boner, but once aging she held me there.“Umm Em, I need to move” I said, starting to worry about that she might notice what was happening.“Why, you look so good as you are” she replied and her hand moved lower.“Really Em, I should.....I mean I’m....”“I know.... getting a hard-on” She said, and with that her hand. She didn't have long to wonder. At that moment, her bedroom door flew open and Biff and Scotty entered. The Irish terrier gave a welcoming bark and bounded up onto his mistress' bed."Ooooh, Scotty, good morning," Gail said with a little laugh as her pet washed her entire face with his big flopping tongue."Hi, Sis, ready for some fun?" Biff husked, slowly stroking his naked hard-on."Oh, Biff, you're all naked!" Gail cried, really looking at her big brother for the first time since he had entered. So I slowly unbuttoned her sexy black shirt. She was wearing a black bra and in this semi nude pose she was looking like an apsara, then I removed her mini skirt as well she was wearing a black panty too now it was her turn she undressed within seconds, now I started massaging her boobs and rubbing her pussy, when I started feeling her wetness then I removed her panty and bra also and offered her to suck my dick to which she first denied but after a lot of request she agreed, omg! She was.